13604381 has 16 divisors (see below), whose sum is σ = 16293888. Its totient is φ = 11113200.

The previous prime is 13604363. The next prime is 13604389. The reversal of 13604381 is 18340631.

It is not a de Polignac number, because 13604381 - 2⁶ = 13604317 is a prime.

It is a super-2 number, since 2×13604381² = 370158364786322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13604381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13604389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14966 + ... + 15848.

It is an arithmetic number, because the mean of its divisors is an integer number (1018368).

Almost surely, 2^13604381 is an apocalyptic number.

It is an amenable number.

13604381 is a deficient number, since it is larger than the sum of its proper divisors (2689507).

13604381 is an equidigital number, since it uses as much as digits as its factorization.

13604381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 13604381 is about 3688.4117177994. The cubic root of 13604381 is about 238.7222662704.

The spelling of 13604381 in words is "thirteen million, six hundred four thousand, three hundred eighty-one".