13381564 has 12 divisors (see below), whose sum is σ = 26763184. Its totient is φ = 5734944.

The previous prime is 13381549. The next prime is 13381597. The reversal of 13381564 is 46518331.

13381564 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238929 + ... + 238984.

Almost surely, 2^13381564 is an apocalyptic number.

13381564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13381564 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.

13381564 is a wasteful number, since it uses less digits than its factorization.

13381564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477924 (or 477922 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 13381564 is about 3658.0820111091. The cubic root of 13381564 is about 237.4117951312.

Adding to 13381564 its reverse (46518331), we get a palindrome (59899895).

The spelling of 13381564 in words is "thirteen million, three hundred eighty-one thousand, five hundred sixty-four".