| Base | Representation |
|---|---|
| bin | 101001111001000… |
| … | …0110000100011100 |
| 3 | 10121221221221221100 |
| 4 | 1103302012010130 |
| 5 | 10334321002423 |
| 6 | 351251433100 |
| 7 | 46555515453 |
| oct | 12362060434 |
| 9 | 3557857840 |
| 10 | 1405640988 |
| 11 | 6614a1974 |
| 12 | 3328b5790 |
| 13 | 1952a523b |
| 14 | d497db9a |
| 15 | 8360b343 |
| hex | 53c8611c |
1405640988 has 108 divisors (see below), whose sum is σ = 3823249248. Its totient is φ = 433935360.
The previous prime is 1405640983. The next prime is 1405640993. The reversal of 1405640988 is 8890465041.
1405640988 is a `hidden beast` number, since 1 + 4 + 0 + 564 + 0 + 9 + 88 = 666.
It is an interprime number because it is at equal distance from previous prime (1405640983) and next prime (1405640993).
It is a super-2 number, since 2×14056409882 = 3951653174291232288, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1405640981) by changing a digit.
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 35 ways as a sum of consecutive naturals, for example, 3261133 + ... + 3261563.
It is an arithmetic number, because the mean of its divisors is an integer number (35400456).
Almost surely, 21405640988 is an apocalyptic number.
1405640988 is a gapful number since it is divisible by the number (18) 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 1405640988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1911624624).
1405640988 is an abundant number, since it is smaller than the sum of its proper divisors (2417608260).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1405640988 is a wasteful number, since it uses less digits than its factorization.
1405640988 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 604 (or 526 counting only the distinct ones).
The product of its (nonzero) digits is 276480, while the sum is 45.
The square root of 1405640988 is about 37491.8789606496. The cubic root of 1405640988 is about 1120.1894311815.
The spelling of 1405640988 in words is "one billion, four hundred five million, six hundred forty thousand, nine hundred eighty-eight".
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