18208140 has 24 divisors (see below), whose sum is σ = 50982960. Its totient is φ = 4855488.

The previous prime is 18208133. The next prime is 18208159. The reversal of 18208140 is 4180281.

It is a self number, because there is not a number n which added to its sum of digits gives 18208140.

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, 151675 + ... + 151794.

It is an arithmetic number, because the mean of its divisors is an integer number (2124290).

Almost surely, 2^18208140 is an apocalyptic number.

18208140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18208140 is an abundant number, since it is smaller than the sum of its proper divisors (32774820).

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

18208140 is a wasteful number, since it uses less digits than its factorization.

18208140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303481 (or 303479 counting only the distinct ones).

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

The square root of 18208140 is about 4267.0997176068. The cubic root of 18208140 is about 263.0804208851.

The spelling of 18208140 in words is "eighteen million, two hundred eight thousand, one hundred forty".