18304680 has 32 divisors (see below), whose sum is σ = 54914400. Its totient is φ = 4881216.

The previous prime is 18304661. The next prime is 18304681. The reversal of 18304680 is 8640381.

It is a happy number.

It is a super-2 number, since 2×18304680² = 670122619804800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (18304681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76150 + ... + 76389.

It is an arithmetic number, because the mean of its divisors is an integer number (1716075).

Almost surely, 2^18304680 is an apocalyptic number.

18304680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18304680 is an abundant number, since it is smaller than the sum of its proper divisors (36609720).

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

18304680 is a wasteful number, since it uses less digits than its factorization.

18304680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152553 (or 152549 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18304680 is about 4278.3968960348. The cubic root of 18304680 is about 263.5445544911.

The spelling of 18304680 in words is "eighteen million, three hundred four thousand, six hundred eighty".