13638381 has 16 divisors (see below), whose sum is σ = 19137600. Its totient is φ = 8626688.

The previous prime is 13638377. The next prime is 13638397. The reversal of 13638381 is 18383631.

It is a happy number.

13638381 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13638381 - 2² = 13638377 is a prime.

It is a super-2 number, since 2×13638381² = 372010872602322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638341) 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, 3805 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (1196100).

Almost surely, 2^13638381 is an apocalyptic number.

It is an amenable number.

13638381 is a deficient number, since it is larger than the sum of its proper divisors (5499219).

13638381 is a wasteful number, since it uses less digits than its factorization.

13638381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748.

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

The square root of 13638381 is about 3693.0178716058. The cubic root of 13638381 is about 238.9209719865.

The spelling of 13638381 in words is "thirteen million, six hundred thirty-eight thousand, three hundred eighty-one".