13390644 has 24 divisors (see below), whose sum is σ = 31314528. Its totient is φ = 4453600.

The previous prime is 13390631. The next prime is 13390661. The reversal of 13390644 is 44609331.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6094 + ... + 7994.

It is an arithmetic number, because the mean of its divisors is an integer number (1304772).

Almost surely, 2^13390644 is an apocalyptic number.

It is an amenable number.

13390644 is an abundant number, since it is smaller than the sum of its proper divisors (17923884).

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

13390644 is a wasteful number, since it uses less digits than its factorization.

13390644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495 (or 2493 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 13390644 is about 3659.3228881857. The cubic root of 13390644 is about 237.4654812251.

Adding to 13390644 its reverse (44609331), we get a palindrome (57999975).

The spelling of 13390644 in words is "thirteen million, three hundred ninety thousand, six hundred forty-four".