18157023 has 6 divisors (see below), whose sum is σ = 26226824. Its totient is φ = 12104676.

The previous prime is 18157019. The next prime is 18157031. The reversal of 18157023 is 32075181.

It is not a de Polignac number, because 18157023 - 2² = 18157019 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 (18157523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1008715 + ... + 1008732.

Almost surely, 2^18157023 is an apocalyptic number.

18157023 is a deficient number, since it is larger than the sum of its proper divisors (8069801).

18157023 is a wasteful number, since it uses less digits than its factorization.

18157023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017453 (or 2017450 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 18157023 is about 4261.1058423841. The cubic root of 18157023 is about 262.8340020502.

The spelling of 18157023 in words is "eighteen million, one hundred fifty-seven thousand, twenty-three".