15118438440 has 128 divisors (see below), whose sum is σ = 52892640000. Its totient is φ = 3455633664.

The previous prime is 15118438411. The next prime is 15118438451. The reversal of 15118438440 is 4483481151.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142495 + ... + 224814.

It is an arithmetic number, because the mean of its divisors is an integer number (413223750).

Almost surely, 2^15118438440 is an apocalyptic number.

15118438440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15118438440 is an abundant number, since it is smaller than the sum of its proper divisors (37774201560).

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

15118438440 is a wasteful number, since it uses less digits than its factorization.

15118438440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367344 (or 367326 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The spelling of 15118438440 in words is "fifteen billion, one hundred eighteen million, four hundred thirty-eight thousand, four hundred forty".