18805998 has 16 divisors (see below), whose sum is σ = 37985616. Its totient is φ = 6206400.

The previous prime is 18805951. The next prime is 18806077. The reversal of 18805998 is 89950881.

It is a Curzon number.

It is a congruent 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, 14911 + ... + 16122.

It is an arithmetic number, because the mean of its divisors is an integer number (2374101).

Almost surely, 2^18805998 is an apocalyptic number.

18805998 is an abundant number, since it is smaller than the sum of its proper divisors (19179618).

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

18805998 is a wasteful number, since it uses less digits than its factorization.

18805998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31139.

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 18805998 is about 4336.5882903499. The cubic root of 18805998 is about 265.9288539067.

The spelling of 18805998 in words is "eighteen million, eight hundred five thousand, nine hundred ninety-eight".