18397320 has 64 divisors (see below), whose sum is σ = 58104000. Its totient is φ = 4647168.

The previous prime is 18397273. The next prime is 18397333. The reversal of 18397320 is 2379381.

It is a super-2 number, since 2×18397320² = 676922766364800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1755 + ... + 6314.

It is an arithmetic number, because the mean of its divisors is an integer number (907875).

Almost surely, 2^18397320 is an apocalyptic number.

18397320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18397320 is an abundant number, since it is smaller than the sum of its proper divisors (39706680).

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

18397320 is a wasteful number, since it uses less digits than its factorization.

18397320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8102 (or 8098 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 18397320 is about 4289.2097174188. The cubic root of 18397320 is about 263.9884062861.

The spelling of 18397320 in words is "eighteen million, three hundred ninety-seven thousand, three hundred twenty".