18411957 has 6 divisors (see below), whose sum is σ = 26595062. Its totient is φ = 12274632.

The previous prime is 18411947. The next prime is 18411961. The reversal of 18411957 is 75911481.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 5731236 = 3561^2 + 2394^2 .

It is not a de Polignac number, because 18411957 - 2⁴ = 18411941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18411907) 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 5 ways as a sum of consecutive naturals, for example, 1022878 + ... + 1022895.

Almost surely, 2^18411957 is an apocalyptic number.

It is an amenable number.

18411957 is a deficient number, since it is larger than the sum of its proper divisors (8183105).

18411957 is a wasteful number, since it uses less digits than its factorization.

18411957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045779 (or 2045776 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 18411957 is about 4290.9156365512. The cubic root of 18411957 is about 264.0583978939.

The spelling of 18411957 in words is "eighteen million, four hundred eleven thousand, nine hundred fifty-seven".