15399401888 has 48 divisors (see below), whose sum is σ = 33446064456. Its totient is φ = 6934056960.

The previous prime is 15399401881. The next prime is 15399401893. The reversal of 15399401888 is 88810499351.

It can be written as a sum of positive squares in 4 ways, for example, as 3927278224 + 11472123664 = 62668^2 + 107108^2 .

It is not an unprimeable number, because it can be changed into a prime (15399401881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434381 + ... + 468492.

Almost surely, 2^15399401888 is an apocalyptic number.

It is an amenable number.

15399401888 is an abundant number, since it is smaller than the sum of its proper divisors (18046662568).

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

15399401888 is a wasteful number, since it uses less digits than its factorization.

15399401888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902937 (or 902929 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 56.

The spelling of 15399401888 in words is "fifteen billion, three hundred ninety-nine million, four hundred one thousand, eight hundred eighty-eight".