18474990 has 16 divisors (see below), whose sum is σ = 44340048. Its totient is φ = 4926656.

The previous prime is 18474931. The next prime is 18474991. The reversal of 18474990 is 9947481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18474991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307887 + ... + 307946.

It is an arithmetic number, because the mean of its divisors is an integer number (2771253).

Almost surely, 2^18474990 is an apocalyptic number.

18474990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18474990 is an abundant number, since it is smaller than the sum of its proper divisors (25865058).

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

18474990 is a wasteful number, since it uses less digits than its factorization.

18474990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615843.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18474990 is about 4298.2542968047. The cubic root of 18474990 is about 264.3593877182.

The spelling of 18474990 in words is "eighteen million, four hundred seventy-four thousand, nine hundred ninety".