18682857 has 12 divisors (see below), whose sum is σ = 27090180. Its totient is φ = 12407328.

The previous prime is 18682849. The next prime is 18682901. The reversal of 18682857 is 75828681.

It can be written as a sum of positive squares in 2 ways, for example, as 4575321 + 14107536 = 2139^2 + 3756^2 .

It is not a de Polignac number, because 18682857 - 2³ = 18682849 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18682957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1438 + ... + 6279.

It is an arithmetic number, because the mean of its divisors is an integer number (2257515).

Almost surely, 2^18682857 is an apocalyptic number.

It is an amenable number.

18682857 is a deficient number, since it is larger than the sum of its proper divisors (8407323).

18682857 is a wasteful number, since it uses less digits than its factorization.

18682857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7992 (or 7989 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 18682857 is about 4322.3670598412. The cubic root of 18682857 is about 265.3471515338.

The spelling of 18682857 in words is "eighteen million, six hundred eighty-two thousand, eight hundred fifty-seven".