13931538 has 8 divisors (see below), whose sum is σ = 27863088. Its totient is φ = 4643844.

The previous prime is 13931531. The next prime is 13931557. The reversal of 13931538 is 83513931.

It is a sphenic number, since it is the product of 3 distinct primes.

13931538 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 13931499 and 13931508.

It is not an unprimeable number, because it can be changed into a prime (13931531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1160956 + ... + 1160967.

It is an arithmetic number, because the mean of its divisors is an integer number (3482886).

Almost surely, 2^13931538 is an apocalyptic number.

13931538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13931538 is a wasteful number, since it uses less digits than its factorization.

13931538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321928.

The product of its digits is 9720, while the sum is 33.

The square root of 13931538 is about 3732.4975552571. The cubic root of 13931538 is about 240.6207196180.

The spelling of 13931538 in words is "thirteen million, nine hundred thirty-one thousand, five hundred thirty-eight".