18198315 has 24 divisors (see below), whose sum is σ = 31677360. Its totient is φ = 9664704.

The previous prime is 18198307. The next prime is 18198317. The reversal of 18198315 is 51389181.

It is not a de Polignac number, because 18198315 - 2³ = 18198307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18198315.

It is not an unprimeable number, because it can be changed into a prime (18198317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12021 + ... + 13449.

It is an arithmetic number, because the mean of its divisors is an integer number (1319890).

Almost surely, 2^18198315 is an apocalyptic number.

18198315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18198315 is a deficient number, since it is larger than the sum of its proper divisors (13479045).

18198315 is a wasteful number, since it uses less digits than its factorization.

18198315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723 (or 1720 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 18198315 is about 4265.9483119232. The cubic root of 18198315 is about 263.0330935143.

The spelling of 18198315 in words is "eighteen million, one hundred ninety-eight thousand, three hundred fifteen".