13613866 has 12 divisors (see below), whose sum is σ = 23754978. Its totient is φ = 5834472.

The previous prime is 13613863. The next prime is 13613869. The reversal of 13613866 is 66831631.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13613863) and next prime (13613869).

It can be written as a sum of positive squares in only one way, i.e., 13505625 + 108241 = 3675^2 + 329^2 .

It is not an unprimeable number, because it can be changed into a prime (13613863) 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, 69361 + ... + 69556.

Almost surely, 2^13613866 is an apocalyptic number.

13613866 is a deficient number, since it is larger than the sum of its proper divisors (10141112).

13613866 is a wasteful number, since it uses less digits than its factorization.

13613866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138933 (or 138926 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 13613866 is about 3689.6972775554. The cubic root of 13613866 is about 238.7777325862. Note that the first 4 decimals are identical.

The spelling of 13613866 in words is "thirteen million, six hundred thirteen thousand, eight hundred sixty-six".