18308840 has 32 divisors (see below), whose sum is σ = 44940960. Its totient is φ = 6657600.

The previous prime is 18308833. The next prime is 18308863. The reversal of 18308840 is 4880381.

It is a junction number, because it is equal to n+sod(n) for n = 18308797 and 18308806.

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, 20366 + ... + 21245.

It is an arithmetic number, because the mean of its divisors is an integer number (1404405).

Almost surely, 2^18308840 is an apocalyptic number.

18308840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18308840 is an abundant number, since it is smaller than the sum of its proper divisors (26632120).

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

18308840 is a wasteful number, since it uses less digits than its factorization.

18308840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41633 (or 41629 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 18308840 is about 4278.8830318203. The cubic root of 18308840 is about 263.5645177337.

The spelling of 18308840 in words is "eighteen million, three hundred eight thousand, eight hundred forty".