13991264 has 36 divisors (see below), whose sum is σ = 32046084. Its totient is φ = 5995584.

The previous prime is 13991251. The next prime is 13991273. The reversal of 13991264 is 46219931.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2894 + ... + 6029.

It is an arithmetic number, because the mean of its divisors is an integer number (890169).

Almost surely, 2^13991264 is an apocalyptic number.

13991264 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13991264 is an abundant number, since it is smaller than the sum of its proper divisors (18054820).

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

13991264 is an equidigital number, since it uses as much as digits as its factorization.

13991264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8947 (or 8932 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 13991264 is about 3740.4898074985. The cubic root of 13991264 is about 240.9640850276.

The spelling of 13991264 in words is "thirteen million, nine hundred ninety-one thousand, two hundred sixty-four".