18120930 has 16 divisors (see below), whose sum is σ = 43490304. Its totient is φ = 4832240.

The previous prime is 18120919. The next prime is 18120937. The reversal of 18120930 is 3902181.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18120930.

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 7 ways as a sum of consecutive naturals, for example, 301986 + ... + 302045.

It is an arithmetic number, because the mean of its divisors is an integer number (2718144).

Almost surely, 2^18120930 is an apocalyptic number.

18120930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18120930 is an abundant number, since it is smaller than the sum of its proper divisors (25369374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18120930 is a wasteful number, since it uses less digits than its factorization.

18120930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604041.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 18120930 is about 4256.8685673861. The cubic root of 18120930 is about 262.6597304492.

The spelling of 18120930 in words is "eighteen million, one hundred twenty thousand, nine hundred thirty".