18490930 has 16 divisors (see below), whose sum is σ = 33830424. Its totient is φ = 7274880.

The previous prime is 18490921. The next prime is 18490931. The reversal of 18490930 is 3909481.

It can be written as a sum of positive squares in 4 ways, for example, as 13786369 + 4704561 = 3713^2 + 2169^2 .

It is not an unprimeable number, because it can be changed into a prime (18490931) 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, 14547 + ... + 15766.

Almost surely, 2^18490930 is an apocalyptic number.

18490930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18490930 is a deficient number, since it is larger than the sum of its proper divisors (15339494).

18490930 is a wasteful number, since it uses less digits than its factorization.

18490930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30381.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18490930 is about 4300.1081381751. The cubic root of 18490930 is about 264.4353945672.

The spelling of 18490930 in words is "eighteen million, four hundred ninety thousand, nine hundred thirty".