18158944 has 12 divisors (see below), whose sum is σ = 35750484. Its totient is φ = 9079456.

The previous prime is 18158929. The next prime is 18158951. The reversal of 18158944 is 44985181.

It is a junction number, because it is equal to n+sod(n) for n = 18158897 and 18158906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283702 + ... + 283765.

It is an arithmetic number, because the mean of its divisors is an integer number (2979207).

Almost surely, 2^18158944 is an apocalyptic number.

It is an amenable number.

18158944 is a deficient number, since it is larger than the sum of its proper divisors (17591540).

18158944 is an equidigital number, since it uses as much as digits as its factorization.

18158944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567477 (or 567469 counting only the distinct ones).

The product of its digits is 46080, while the sum is 40.

The square root of 18158944 is about 4261.3312473921. The cubic root of 18158944 is about 262.8432709396.

The spelling of 18158944 in words is "eighteen million, one hundred fifty-eight thousand, nine hundred forty-four".