13990731 has 8 divisors (see below), whose sum is σ = 19297680. Its totient is φ = 9005472.

The previous prime is 13990727. The next prime is 13990747. The reversal of 13990731 is 13709931.

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

It is not a de Polignac number, because 13990731 - 2² = 13990727 is a prime.

It is a super-2 number, since 2×13990731² = 391481107828722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 13990692 and 13990701.

It is not an unprimeable number, because it can be changed into a prime (13990721) 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, 80320 + ... + 80493.

It is an arithmetic number, because the mean of its divisors is an integer number (2412210).

Almost surely, 2^13990731 is an apocalyptic number.

13990731 is a deficient number, since it is larger than the sum of its proper divisors (5306949).

13990731 is a wasteful number, since it uses less digits than its factorization.

13990731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160845.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 13990731 is about 3740.4185594663. The cubic root of 13990731 is about 240.9610251304.

The spelling of 13990731 in words is "thirteen million, nine hundred ninety thousand, seven hundred thirty-one".