18662004 has 18 divisors (see below), whose sum is σ = 47173490. Its totient is φ = 6220656.

The previous prime is 18661997. The next prime is 18662027. The reversal of 18662004 is 40026681.

It can be written as a sum of positive squares in only one way, i.e., 11209104 + 7452900 = 3348^2 + 2730^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 259159 + ... + 259230.

Almost surely, 2^18662004 is an apocalyptic number.

It is an amenable number.

18662004 is an abundant number, since it is smaller than the sum of its proper divisors (28511486).

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

18662004 is a wasteful number, since it uses less digits than its factorization.

18662004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518399 (or 518394 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18662004 is about 4319.9541664235. The cubic root of 18662004 is about 265.2483917617.

Adding to 18662004 its reverse (40026681), we get a palindrome (58688685).

The spelling of 18662004 in words is "eighteen million, six hundred sixty-two thousand, four".