18500057 has 4 divisors (see below), whose sum is σ = 19138020. Its totient is φ = 17862096.

The previous prime is 18500051. The next prime is 18500071. The reversal of 18500057 is 75000581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3297856 + 15202201 = 1816^2 + 3899^2 .

It is a cyclic number.

It is not a de Polignac number, because 18500057 - 2⁸ = 18499801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18499999 and 18500035.

It is not an unprimeable number, because it can be changed into a prime (18500051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318938 + ... + 318995.

It is an arithmetic number, because the mean of its divisors is an integer number (4784505).

Almost surely, 2^18500057 is an apocalyptic number.

It is an amenable number.

18500057 is a deficient number, since it is larger than the sum of its proper divisors (637963).

18500057 is an equidigital number, since it uses as much as digits as its factorization.

18500057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637962.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 18500057 is about 4301.1692596316. The cubic root of 18500057 is about 264.4788952611.

It can be divided in two parts, 1 and 8500057, that added together give a palindrome (8500058).

The spelling of 18500057 in words is "eighteen million, five hundred thousand, fifty-seven".