13665812 has 6 divisors (see below), whose sum is σ = 23915178. Its totient is φ = 6832904.

The previous prime is 13665811. The next prime is 13665851. The reversal of 13665812 is 21856631.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10995856 + 2669956 = 3316^2 + 1634^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1708223 + ... + 1708230.

It is an arithmetic number, because the mean of its divisors is an integer number (3985863).

Almost surely, 2^13665812 is an apocalyptic number.

It is an amenable number.

13665812 is a deficient number, since it is larger than the sum of its proper divisors (10249366).

13665812 is a wasteful number, since it uses less digits than its factorization.

13665812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3416457 (or 3416455 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 13665812 is about 3696.7299062820. The cubic root of 13665812 is about 239.0810460244.

The spelling of 13665812 in words is "thirteen million, six hundred sixty-five thousand, eight hundred twelve".