18204490 has 8 divisors (see below), whose sum is σ = 32768100. Its totient is φ = 7281792.

The previous prime is 18204469. The next prime is 18204491. The reversal of 18204490 is 9440281.

It can be written as a sum of positive squares in 2 ways, for example, as 17732521 + 471969 = 4211^2 + 687^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18204491) 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, 910215 + ... + 910234.

Almost surely, 2^18204490 is an apocalyptic number.

18204490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18204490 is a deficient number, since it is larger than the sum of its proper divisors (14563610).

18204490 is a wasteful number, since it uses less digits than its factorization.

18204490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820456.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18204490 is about 4266.6720052050. The cubic root of 18204490 is about 263.0628406947.

The spelling of 18204490 in words is "eighteen million, two hundred four thousand, four hundred ninety".