18120939 has 4 divisors (see below), whose sum is σ = 24161256. Its totient is φ = 12080624.

The previous prime is 18120937. The next prime is 18120959. The reversal of 18120939 is 93902181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18120939 - 2¹ = 18120937 is a prime.

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, 3020154 + ... + 3020159.

It is an arithmetic number, because the mean of its divisors is an integer number (6040314).

Almost surely, 2^18120939 is an apocalyptic number.

18120939 is a deficient number, since it is larger than the sum of its proper divisors (6040317).

18120939 is an equidigital number, since it uses as much as digits as its factorization.

18120939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040316.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 18120939 is about 4256.8696245011. The cubic root of 18120939 is about 262.6597739337.

The spelling of 18120939 in words is "eighteen million, one hundred twenty thousand, nine hundred thirty-nine".