18604018 has 16 divisors (see below), whose sum is σ = 29857464. Its totient is φ = 8663040.

The previous prime is 18604009. The next prime is 18604031. The reversal of 18604018 is 81040681.

It can be written as a sum of positive squares in 4 ways, for example, as 18515809 + 88209 = 4303^2 + 297^2 .

It is a super-2 number, since 2×18604018² = 692218971488648, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478 + ... + 6118.

Almost surely, 2^18604018 is an apocalyptic number.

18604018 is a deficient number, since it is larger than the sum of its proper divisors (11253446).

18604018 is a wasteful number, since it uses less digits than its factorization.

18604018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5757.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 18604018 is about 4313.2375311360. The cubic root of 18604018 is about 264.9733828731.

Adding to 18604018 its reverse (81040681), we get a palindrome (99644699).

The spelling of 18604018 in words is "eighteen million, six hundred four thousand, eighteen".