18502057 has 6 divisors (see below), whose sum is σ = 21522858. Its totient is φ = 15858864.

The previous prime is 18502039. The next prime is 18502061. The reversal of 18502057 is 75020581.

It can be written as a sum of positive squares in only one way, i.e., 9357481 + 9144576 = 3059^2 + 3024^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18502057 is a prime.

It is a super-2 number, since 2×18502057² = 684652226462498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18502457) 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 5 ways as a sum of consecutive naturals, for example, 188748 + ... + 188845.

It is an arithmetic number, because the mean of its divisors is an integer number (3587143).

Almost surely, 2^18502057 is an apocalyptic number.

It is an amenable number.

18502057 is a deficient number, since it is larger than the sum of its proper divisors (3020801).

18502057 is an equidigital number, since it uses as much as digits as its factorization.

18502057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377607 (or 377600 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 18502057 is about 4301.4017482677. The cubic root of 18502057 is about 264.4884256593.

It can be divided in two parts, 1 and 8502057, that added together give a palindrome (8502058).

The spelling of 18502057 in words is "eighteen million, five hundred two thousand, fifty-seven".