18380898 has 16 divisors (see below), whose sum is σ = 40846560. Its totient is φ = 6126948.

The previous prime is 18380881. The next prime is 18380899. The reversal of 18380898 is 89808381.

It is a super-2 number, since 2×18380898² = 675714822572808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18380899) 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, 170140 + ... + 170247.

It is an arithmetic number, because the mean of its divisors is an integer number (2552910).

Almost surely, 2^18380898 is an apocalyptic number.

18380898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18380898 is an abundant number, since it is smaller than the sum of its proper divisors (22465662).

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

18380898 is a wasteful number, since it uses less digits than its factorization.

18380898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340398 (or 340392 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 18380898 is about 4287.2949513650. The cubic root of 18380898 is about 263.9098349115.

The spelling of 18380898 in words is "eighteen million, three hundred eighty thousand, eight hundred ninety-eight".