| Base | Representation |
|---|---|
| bin | 100101111001… |
| … | …0100110001000 |
| 3 | 1101101101211100 |
| 4 | 1023302212020 |
| 5 | 20041234130 |
| 6 | 1545501400 |
| 7 | 330606213 |
| oct | 113624610 |
| 9 | 41341740 |
| 10 | 19868040 |
| 11 | 10240175 |
| 12 | 67a1860 |
| 13 | 416834a |
| 14 | 28d277a |
| 15 | 1b26c60 |
| hex | 12f2988 |
19868040 has 96 divisors (see below), whose sum is σ = 65122200. Its totient is φ = 5253120.
The previous prime is 19868033. The next prime is 19868047. The reversal of 19868040 is 4086891.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (19868033) and next prime (19868047).
It can be written as a sum of positive squares in 4 ways, for example, as 19766916 + 101124 = 4446^2 + 318^2 .
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 19867986 and 19868004.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19868047) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82320 + ... + 82560.
Almost surely, 219868040 is an apocalyptic number.
19868040 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 19868040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32561100).
19868040 is an abundant number, since it is smaller than the sum of its proper divisors (45254160).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
19868040 is a wasteful number, since it uses less digits than its factorization.
19868040 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 487 (or 480 counting only the distinct ones).
The product of its (nonzero) digits is 13824, while the sum is 36.
The square root of 19868040 is about 4457.3579618424. The cubic root of 19868040 is about 270.8434529289.
The spelling of 19868040 in words is "nineteen million, eight hundred sixty-eight thousand, forty".
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