18519957 has 12 divisors (see below), whose sum is σ = 26810784. Its totient is φ = 12319080.

The previous prime is 18519937. The next prime is 18519959. The reversal of 18519957 is 75991581.

It is not a de Polignac number, because 18519957 - 2⁷ = 18519829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18519959) 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 11 ways as a sum of consecutive naturals, for example, 2482 + ... + 6572.

It is an arithmetic number, because the mean of its divisors is an integer number (2234232).

Almost surely, 2^18519957 is an apocalyptic number.

It is an amenable number.

18519957 is a deficient number, since it is larger than the sum of its proper divisors (8290827).

18519957 is a wasteful number, since it uses less digits than its factorization.

18519957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600 (or 4597 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 18519957 is about 4303.4819623184. The cubic root of 18519957 is about 264.5736921584.

The spelling of 18519957 in words is "eighteen million, five hundred nineteen thousand, nine hundred fifty-seven".