18505004 has 12 divisors (see below), whose sum is σ = 37010064. Its totient is φ = 7930704.

The previous prime is 18504991. The next prime is 18505013. The reversal of 18505004 is 40050581.

18505004 is an admirable 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, 330419 + ... + 330474.

It is an arithmetic number, because the mean of its divisors is an integer number (3084172).

Almost surely, 2^18505004 is an apocalyptic number.

18505004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18505004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18505004 is a wasteful number, since it uses less digits than its factorization.

18505004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660904 (or 660902 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 18505004 is about 4301.7442973752. The cubic root of 18505004 is about 264.5024674496.

Adding to 18505004 its reverse (40050581), we get a palindrome (58555585).

The spelling of 18505004 in words is "eighteen million, five hundred five thousand, four".