18090898 has 24 divisors (see below), whose sum is σ = 31715712. Its totient is φ = 7716744.

The previous prime is 18090889. The next prime is 18090899. The reversal of 18090898 is 89809081.

It is not an unprimeable number, because it can be changed into a prime (18090899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35715 + ... + 36217.

It is an arithmetic number, because the mean of its divisors is an integer number (1321488).

Almost surely, 2^18090898 is an apocalyptic number.

18090898 is a deficient number, since it is larger than the sum of its proper divisors (13624814).

18090898 is a wasteful number, since it uses less digits than its factorization.

18090898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 18090898 is about 4253.3396290445. The cubic root of 18090898 is about 262.5145473419.

The spelling of 18090898 in words is "eighteen million, ninety thousand, eight hundred ninety-eight".