18800857 has 2 divisors, whose sum is σ = 18800858. Its totient is φ = 18800856.

The previous prime is 18800843. The next prime is 18800869. The reversal of 18800857 is 75800881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15492096 + 3308761 = 3936^2 + 1819^2 .

It is a cyclic number.

It is not a de Polignac number, because 18800857 - 2¹⁵ = 18768089 is a prime.

It is not a weakly prime, because it can be changed into another prime (18800897) 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 as a sum of consecutive naturals, namely, 9400428 + 9400429.

It is an arithmetic number, because the mean of its divisors is an integer number (9400429).

Almost surely, 2^18800857 is an apocalyptic number.

It is an amenable number.

18800857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18800857 is an equidigital number, since it uses as much as digits as its factorization.

18800857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 18800857 is about 4335.9955027652. The cubic root of 18800857 is about 265.9046193543.

The spelling of 18800857 in words is "eighteen million, eight hundred thousand, eight hundred fifty-seven".