18390474 has 24 divisors (see below), whose sum is σ = 40119300. Its totient is φ = 6088128.

The previous prime is 18390467. The next prime is 18390487. The reversal of 18390474 is 47409381.

It is a happy number.

18390474 is a `hidden beast` number, since 183 + 9 + 0 + 474 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13068225 + 5322249 = 3615^2 + 2307^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 747 + ... + 6110.

Almost surely, 2^18390474 is an apocalyptic number.

18390474 is an abundant number, since it is smaller than the sum of its proper divisors (21728826).

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

18390474 is a wasteful number, since it uses less digits than its factorization.

18390474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7014 (or 7011 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 18390474 is about 4288.4115940520. The cubic root of 18390474 is about 263.9556571529.

The spelling of 18390474 in words is "eighteen million, three hundred ninety thousand, four hundred seventy-four".