13990931 has 4 divisors (see below), whose sum is σ = 14097864. Its totient is φ = 13884000.

The previous prime is 13990927. The next prime is 13990943. The reversal of 13990931 is 13909931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13990931 - 2² = 13990927 is a prime.

It is a super-2 number, since 2×13990931² = 391492300493522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13990891 and 13990900.

It is not an unprimeable number, because it can be changed into a prime (13990531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53270 + ... + 53531.

It is an arithmetic number, because the mean of its divisors is an integer number (3524466).

Almost surely, 2^13990931 is an apocalyptic number.

13990931 is a deficient number, since it is larger than the sum of its proper divisors (106933).

13990931 is a wasteful number, since it uses less digits than its factorization.

13990931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106932.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 13990931 is about 3740.4452943467. The cubic root of 13990931 is about 240.9621733185.

The spelling of 13990931 in words is "thirteen million, nine hundred ninety thousand, nine hundred thirty-one".