18531004 has 12 divisors (see below), whose sum is σ = 34136200. Its totient is φ = 8777808.

The previous prime is 18530989. The next prime is 18531017. The reversal of 18531004 is 40013581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121839 + ... + 121990.

Almost surely, 2^18531004 is an apocalyptic number.

It is an amenable number.

18531004 is a deficient number, since it is larger than the sum of its proper divisors (15605196).

18531004 is a wasteful number, since it uses less digits than its factorization.

18531004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243852 (or 243850 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18531004 is about 4304.7652665389. The cubic root of 18531004 is about 264.6262870364.

Adding to 18531004 its reverse (40013581), we get a palindrome (58544585).

The spelling of 18531004 in words is "eighteen million, five hundred thirty-one thousand, four".