15813987938 has 16 divisors (see below), whose sum is σ = 27378108864. Its totient is φ = 6710319600.

The previous prime is 15813987901. The next prime is 15813987949. The reversal of 15813987938 is 83978931851.

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, 5590520 + ... + 5593347.

It is an arithmetic number, because the mean of its divisors is an integer number (1711131804).

Almost surely, 2^15813987938 is an apocalyptic number.

15813987938 is a deficient number, since it is larger than the sum of its proper divisors (11564120926).

15813987938 is a wasteful number, since it uses less digits than its factorization.

15813987938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11183977.

The product of its digits is 13063680, while the sum is 62.

The spelling of 15813987938 in words is "fifteen billion, eight hundred thirteen million, nine hundred eighty-seven thousand, nine hundred thirty-eight".