18990498 has 8 divisors (see below), whose sum is σ = 37981008. Its totient is φ = 6330164.

The previous prime is 18990493. The next prime is 18990523. The reversal of 18990498 is 89409981.

It is a sphenic number, since it is the product of 3 distinct primes.

18990498 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18990493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1582536 + ... + 1582547.

It is an arithmetic number, because the mean of its divisors is an integer number (4747626).

Almost surely, 2^18990498 is an apocalyptic number.

18990498 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18990498 is a wasteful number, since it uses less digits than its factorization.

18990498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165088.

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

The square root of 18990498 is about 4357.8088530820. The cubic root of 18990498 is about 266.7956747312.

The spelling of 18990498 in words is "eighteen million, nine hundred ninety thousand, four hundred ninety-eight".