13236381 has 6 divisors (see below), whose sum is σ = 19119230. Its totient is φ = 8824248.

The previous prime is 13236373. The next prime is 13236409. The reversal of 13236381 is 18363231.

It is a happy number.

13236381 is a `hidden beast` number, since 1 + 3 + 23 + 638 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8173881 + 5062500 = 2859^2 + 2250^2 .

It is not a de Polignac number, because 13236381 - 2³ = 13236373 is a prime.

It is a super-2 number, since 2×13236381² = 350403563954322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13236341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 735346 + ... + 735363.

Almost surely, 2^13236381 is an apocalyptic number.

It is an amenable number.

13236381 is a deficient number, since it is larger than the sum of its proper divisors (5882849).

13236381 is a wasteful number, since it uses less digits than its factorization.

13236381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470715 (or 1470712 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 13236381 is about 3638.1837501699. The cubic root of 13236381 is about 236.5500730553.

The spelling of 13236381 in words is "thirteen million, two hundred thirty-six thousand, three hundred eighty-one".