18990468 has 72 divisors (see below), whose sum is σ = 55298880. Its totient is φ = 5382720.

The previous prime is 18990451. The next prime is 18990469. The reversal of 18990468 is 86409981.

18990468 is a `hidden beast` number, since 189 + 9 + 0 + 468 = 666.

It is not an unprimeable number, because it can be changed into a prime (18990469) 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, 44898 + ... + 45318.

It is an arithmetic number, because the mean of its divisors is an integer number (768040).

Almost surely, 2^18990468 is an apocalyptic number.

18990468 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18990468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27649440).

18990468 is an abundant number, since it is smaller than the sum of its proper divisors (36308412).

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

18990468 is a wasteful number, since it uses less digits than its factorization.

18990468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18990468 is about 4357.8054109838. The cubic root of 18990468 is about 266.7955342421.

The spelling of 18990468 in words is "eighteen million, nine hundred ninety thousand, four hundred sixty-eight".