13215644 has 12 divisors (see below), whose sum is σ = 24906504. Its totient is φ = 6099504.

The previous prime is 13215617. The next prime is 13215661. The reversal of 13215644 is 44651231.

It is a Harshad number since it is a multiple of its sum of digits (26).

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 3 ways as a sum of consecutive naturals, for example, 127022 + ... + 127125.

It is an arithmetic number, because the mean of its divisors is an integer number (2075542).

Almost surely, 2^13215644 is an apocalyptic number.

It is an amenable number.

13215644 is a deficient number, since it is larger than the sum of its proper divisors (11690860).

13215644 is a wasteful number, since it uses less digits than its factorization.

13215644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254164 (or 254162 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 13215644 is about 3635.3327220490. The cubic root of 13215644 is about 236.4264767648.

Adding to 13215644 its reverse (44651231), we get a palindrome (57866875).

The spelling of 13215644 in words is "thirteen million, two hundred fifteen thousand, six hundred forty-four".