18456140 has 12 divisors (see below), whose sum is σ = 38757936. Its totient is φ = 7382448.

The previous prime is 18456121. The next prime is 18456157. The reversal of 18456140 is 4165481.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461384 + ... + 461423.

It is an arithmetic number, because the mean of its divisors is an integer number (3229828).

Almost surely, 2^18456140 is an apocalyptic number.

18456140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18456140 is an abundant number, since it is smaller than the sum of its proper divisors (20301796).

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

18456140 is a wasteful number, since it uses less digits than its factorization.

18456140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922816 (or 922814 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 18456140 is about 4296.0609865317. The cubic root of 18456140 is about 264.2694486494.

The spelling of 18456140 in words is "eighteen million, four hundred fifty-six thousand, one hundred forty".