13991236 has 12 divisors (see below), whose sum is σ = 27982528. Its totient is φ = 5996232.

The previous prime is 13991233. The next prime is 13991251. The reversal of 13991236 is 63219931.

13991236 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (13991231) 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, 249816 + ... + 249871.

Almost surely, 2^13991236 is an apocalyptic number.

It is an amenable number.

13991236 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.

13991236 is a wasteful number, since it uses less digits than its factorization.

13991236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499698 (or 499696 counting only the distinct ones).

The product of its digits is 8748, while the sum is 34.

The square root of 13991236 is about 3740.4860646713. The cubic root of 13991236 is about 240.9639242844.

The spelling of 13991236 in words is "thirteen million, nine hundred ninety-one thousand, two hundred thirty-six".