13391844 has 12 divisors (see below), whose sum is σ = 31247664. Its totient is φ = 4463944.

The previous prime is 13391839. The next prime is 13391857. The reversal of 13391844 is 44819331.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 557982 + ... + 558005.

It is an arithmetic number, because the mean of its divisors is an integer number (2603972).

Almost surely, 2^13391844 is an apocalyptic number.

It is an amenable number.

13391844 is an abundant number, since it is smaller than the sum of its proper divisors (17855820).

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

13391844 is a wasteful number, since it uses less digits than its factorization.

13391844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115994 (or 1115992 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 13391844 is about 3659.4868492727. The cubic root of 13391844 is about 237.4725744878.

The spelling of 13391844 in words is "thirteen million, three hundred ninety-one thousand, eight hundred forty-four".