18004840 has 32 divisors (see below), whose sum is σ = 46298880. Its totient is φ = 6172992.

The previous prime is 18004813. The next prime is 18004871. The reversal of 18004840 is 4840081.

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, 31872 + ... + 32431.

It is an arithmetic number, because the mean of its divisors is an integer number (1446840).

Almost surely, 2^18004840 is an apocalyptic number.

18004840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18004840 is an abundant number, since it is smaller than the sum of its proper divisors (28294040).

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

18004840 is a wasteful number, since it uses less digits than its factorization.

18004840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64321 (or 64317 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 18004840 is about 4243.2110482511. The cubic root of 18004840 is about 262.0976269239.

The spelling of 18004840 in words is "eighteen million, four thousand, eight hundred forty".