13865616 has 30 divisors (see below), whose sum is σ = 38804870. Its totient is φ = 4621824.

The previous prime is 13865609. The next prime is 13865617. The reversal of 13865616 is 61656831.

It is a happy number.

13865616 is a `hidden beast` number, since 1 + 38 + 6 + 5 + 616 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12278016 + 1587600 = 3504^2 + 1260^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (13865617) 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, 48001 + ... + 48288.

Almost surely, 2^13865616 is an apocalyptic number.

13865616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13865616 is an abundant number, since it is smaller than the sum of its proper divisors (24939254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13865616 is a wasteful number, since it uses less digits than its factorization.

13865616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96303 (or 96294 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 13865616 is about 3723.6562677025. The cubic root of 13865616 is about 240.2405920671.

The spelling of 13865616 in words is "thirteen million, eight hundred sixty-five thousand, six hundred sixteen".