18313857 has 20 divisors (see below), whose sum is σ = 27483456. Its totient is φ = 12153240.

The previous prime is 18313849. The next prime is 18313861. The reversal of 18313857 is 75831381.

It is not a de Polignac number, because 18313857 - 2³ = 18313849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18313837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24828 + ... + 25554.

Almost surely, 2^18313857 is an apocalyptic number.

It is an amenable number.

18313857 is a deficient number, since it is larger than the sum of its proper divisors (9169599).

18313857 is an equidigital number, since it uses as much as digits as its factorization.

18313857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 1041 counting only the distinct ones).

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

The square root of 18313857 is about 4279.4692427917. The cubic root of 18313857 is about 263.5885895741.

The spelling of 18313857 in words is "eighteen million, three hundred thirteen thousand, eight hundred fifty-seven".