18399180 has 24 divisors (see below), whose sum is σ = 51517872. Its totient is φ = 4906432.

The previous prime is 18399169. The next prime is 18399181. The reversal of 18399180 is 8199381.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18399181) 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, 153267 + ... + 153386.

It is an arithmetic number, because the mean of its divisors is an integer number (2146578).

Almost surely, 2^18399180 is an apocalyptic number.

18399180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18399180 is an abundant number, since it is smaller than the sum of its proper divisors (33118692).

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

18399180 is a wasteful number, since it uses less digits than its factorization.

18399180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306665 (or 306663 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 18399180 is about 4289.4265350977. The cubic root of 18399180 is about 263.9973025436.

The spelling of 18399180 in words is "eighteen million, three hundred ninety-nine thousand, one hundred eighty".