13813857 has 6 divisors (see below), whose sum is σ = 19953362. Its totient is φ = 9209232.

The previous prime is 13813841. The next prime is 13813873. The reversal of 13813857 is 75831831.

It is an interprime number because it is at equal distance from previous prime (13813841) and next prime (13813873).

It can be written as a sum of positive squares in only one way, i.e., 13242321 + 571536 = 3639^2 + 756^2 .

It is not a de Polignac number, because 13813857 - 2⁴ = 13813841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13813357) 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, 767428 + ... + 767445.

Almost surely, 2^13813857 is an apocalyptic number.

It is an amenable number.

13813857 is a deficient number, since it is larger than the sum of its proper divisors (6139505).

13813857 is a wasteful number, since it uses less digits than its factorization.

13813857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534879 (or 1534876 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 13813857 is about 3716.6997457422. The cubic root of 13813857 is about 239.9412877215.

The spelling of 13813857 in words is "thirteen million, eight hundred thirteen thousand, eight hundred fifty-seven".