15855138 has 24 divisors (see below), whose sum is σ = 36995868. Its totient is φ = 4878432.

The previous prime is 15855131. The next prime is 15855157. The reversal of 15855138 is 83155851.

It can be written as a sum of positive squares in 2 ways, for example, as 15705369 + 149769 = 3963^2 + 387^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15855131) 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 11 ways as a sum of consecutive naturals, for example, 33645 + ... + 34112.

Almost surely, 2^15855138 is an apocalyptic number.

15855138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15855138 is an abundant number, since it is smaller than the sum of its proper divisors (21140730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15855138 is a wasteful number, since it uses less digits than its factorization.

15855138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67778 (or 67775 counting only the distinct ones).

The product of its digits is 24000, while the sum is 36.

The square root of 15855138 is about 3981.8510770746. The cubic root of 15855138 is about 251.2214254279.

The spelling of 15855138 in words is "fifteen million, eight hundred fifty-five thousand, one hundred thirty-eight".