18885857 has 2 divisors, whose sum is σ = 18885858. Its totient is φ = 18885856.

The previous prime is 18885847. The next prime is 18885883. The reversal of 18885857 is 75858881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11262736 + 7623121 = 3356^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 18885857 - 2¹² = 18881761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18885847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442928 + 9442929.

It is an arithmetic number, because the mean of its divisors is an integer number (9442929).

Almost surely, 2^18885857 is an apocalyptic number.

It is an amenable number.

18885857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885857 is an equidigital number, since it uses as much as digits as its factorization.

18885857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 716800, while the sum is 50.

The square root of 18885857 is about 4345.7861199097. The cubic root of 18885857 is about 266.3047414756.

The spelling of 18885857 in words is "eighteen million, eight hundred eighty-five thousand, eight hundred fifty-seven".