18904998 has 64 divisors (see below), whose sum is σ = 45139968. Its totient is φ = 5166720.

The previous prime is 18904997. The next prime is 18905017. The reversal of 18904998 is 89940981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18904997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120336 + ... + 120492.

It is an arithmetic number, because the mean of its divisors is an integer number (705312).

Almost surely, 2^18904998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18904998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22569984).

18904998 is an abundant number, since it is smaller than the sum of its proper divisors (26234970).

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

18904998 is a wasteful number, since it uses less digits than its factorization.

18904998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 18904998 is about 4347.9878104705. The cubic root of 18904998 is about 266.3946785814.

The spelling of 18904998 in words is "eighteen million, nine hundred four thousand, nine hundred ninety-eight".