18120938 has 8 divisors (see below), whose sum is σ = 29652480. Its totient is φ = 8236780.

The previous prime is 18120937. The next prime is 18120959. The reversal of 18120938 is 83902181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18120937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411818 + ... + 411861.

It is an arithmetic number, because the mean of its divisors is an integer number (3706560).

Almost surely, 2^18120938 is an apocalyptic number.

18120938 is a deficient number, since it is larger than the sum of its proper divisors (11531542).

18120938 is a wasteful number, since it uses less digits than its factorization.

18120938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823692.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18120938 is about 4256.8695070439. The cubic root of 18120938 is about 262.6597691021.

The spelling of 18120938 in words is "eighteen million, one hundred twenty thousand, nine hundred thirty-eight".