18398860 has 24 divisors (see below), whose sum is σ = 38737440. Its totient is φ = 7340544.

The previous prime is 18398857. The next prime is 18398899. The reversal of 18398860 is 6889381.

It is a happy number.

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, 8796 + ... + 10684.

It is an arithmetic number, because the mean of its divisors is an integer number (1614060).

Almost surely, 2^18398860 is an apocalyptic number.

18398860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18398860 is an abundant number, since it is smaller than the sum of its proper divisors (20338580).

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

18398860 is a wasteful number, since it uses less digits than its factorization.

18398860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385 (or 2383 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18398860 is about 4289.3892339120. The cubic root of 18398860 is about 263.9957720474.

The spelling of 18398860 in words is "eighteen million, three hundred ninety-eight thousand, eight hundred sixty".