13988631 has 8 divisors (see below), whose sum is σ = 19085440. Its totient is φ = 9108792.

The previous prime is 13988629. The next prime is 13988641. The reversal of 13988631 is 13688931.

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

It is not a de Polignac number, because 13988631 - 2¹ = 13988629 is a prime.

It is a super-2 number, since 2×13988631² = 391363594508322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13988631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13988641) 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, 54091 + ... + 54348.

It is an arithmetic number, because the mean of its divisors is an integer number (2385680).

Almost surely, 2^13988631 is an apocalyptic number.

13988631 is a deficient number, since it is larger than the sum of its proper divisors (5096809).

13988631 is a wasteful number, since it uses less digits than its factorization.

13988631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108485.

The product of its digits is 31104, while the sum is 39.

The square root of 13988631 is about 3740.1378316848. The cubic root of 13988631 is about 240.9489684939.

The spelling of 13988631 in words is "thirteen million, nine hundred eighty-eight thousand, six hundred thirty-one".