| Base | Representation |
|---|---|
| bin | 10011010011001… |
| … | …10001110110000 |
| 3 | 102021122100021120 |
| 4 | 21221212032300 |
| 5 | 312421240230 |
| 6 | 24022022240 |
| 7 | 4004060013 |
| oct | 1151461660 |
| 9 | 367570246 |
| 10 | 161899440 |
| 11 | 8342a49a |
| 12 | 46277980 |
| 13 | 277071b1 |
| 14 | 1770537a |
| 15 | e330310 |
| hex | 9a663b0 |
161899440 has 80 divisors (see below), whose sum is σ = 508300800. Its totient is φ = 42621696.
The previous prime is 161899421. The next prime is 161899459. The reversal of 161899440 is 44998161.
161899440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (161899421) and next prime (161899459).
It is a tau number, because it is divible by the number of its divisors (80).
It is a super-2 number, since 2×1618994402 = 52422857344627200, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 161899392 and 161899401.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14691 + ... + 23229.
It is an arithmetic number, because the mean of its divisors is an integer number (6353760).
Almost surely, 2161899440 is an apocalyptic number.
161899440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 161899440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254150400).
161899440 is an abundant number, since it is smaller than the sum of its proper divisors (346401360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161899440 is a wasteful number, since it uses less digits than its factorization.
161899440 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 8634 (or 8628 counting only the distinct ones).
The product of its (nonzero) digits is 62208, while the sum is 42.
The square root of 161899440 is about 12723.9710782444. The cubic root of 161899440 is about 545.0233584243.
The spelling of 161899440 in words is "one hundred sixty-one million, eight hundred ninety-nine thousand, four hundred forty".
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