18120840 has 32 divisors (see below), whose sum is σ = 54362880. Its totient is φ = 4832192.

The previous prime is 18120829. The next prime is 18120857. The reversal of 18120840 is 4802181.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18120840.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75384 + ... + 75623.

It is an arithmetic number, because the mean of its divisors is an integer number (1698840).

Almost surely, 2^18120840 is an apocalyptic number.

18120840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18120840 is an abundant number, since it is smaller than the sum of its proper divisors (36242040).

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

18120840 is a wasteful number, since it uses less digits than its factorization.

18120840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151021 (or 151017 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 18120840 is about 4256.8579962221. The cubic root of 18120840 is about 262.6592956037.

The spelling of 18120840 in words is "eighteen million, one hundred twenty thousand, eight hundred forty".