15438864 has 40 divisors (see below), whose sum is σ = 45582400. Its totient is φ = 4411008.

The previous prime is 15438859. The next prime is 15438881. The reversal of 15438864 is 46883451.

It is a super-2 number, since 2×15438864² = 476717043220992, which contains 22 as substring.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22639 + ... + 23310.

It is an arithmetic number, because the mean of its divisors is an integer number (1139560).

Almost surely, 2^15438864 is an apocalyptic number.

15438864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

15438864 is an abundant number, since it is smaller than the sum of its proper divisors (30143536).

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

15438864 is a wasteful number, since it uses less digits than its factorization.

15438864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45967 (or 45961 counting only the distinct ones).

The product of its digits is 92160, while the sum is 39.

The square root of 15438864 is about 3929.2319860247. The cubic root of 15438864 is about 249.0033063544.

The spelling of 15438864 in words is "fifteen million, four hundred thirty-eight thousand, eight hundred sixty-four".