18158956 has 6 divisors (see below), whose sum is σ = 31778180. Its totient is φ = 9079476.

The previous prime is 18158953. The next prime is 18158977. The reversal of 18158956 is 65985181.

It is not an unprimeable number, because it can be changed into a prime (18158951) 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 as a sum of consecutive naturals, namely, 2269866 + ... + 2269873.

Almost surely, 2^18158956 is an apocalyptic number.

It is an amenable number.

18158956 is a deficient number, since it is larger than the sum of its proper divisors (13619224).

18158956 is a wasteful number, since it uses less digits than its factorization.

18158956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539743 (or 4539741 counting only the distinct ones).

The product of its digits is 86400, while the sum is 43.

The square root of 18158956 is about 4261.3326554025. The cubic root of 18158956 is about 262.8433288379.

The spelling of 18158956 in words is "eighteen million, one hundred fifty-eight thousand, nine hundred fifty-six".