13906431520 has 48 divisors (see below), whose sum is σ = 32861020248. Its totient is φ = 5561374720.

The previous prime is 13906431503. The next prime is 13906431527. The reversal of 13906431520 is 2513460931.

It can be written as a sum of positive squares in 4 ways, for example, as 13379086224 + 527345296 = 115668^2 + 22964^2 .

It is not an unprimeable number, because it can be changed into a prime (13906431527) 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, 1360830 + ... + 1371010.

Almost surely, 2^13906431520 is an apocalyptic number.

13906431520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13906431520 is an abundant number, since it is smaller than the sum of its proper divisors (18954588728).

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

13906431520 is a wasteful number, since it uses less digits than its factorization.

13906431520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18733 (or 18725 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 13906431520 in words is "thirteen billion, nine hundred six million, four hundred thirty-one thousand, five hundred twenty".