18240004 has 6 divisors (see below), whose sum is σ = 31920014. Its totient is φ = 9120000.

The previous prime is 18239993. The next prime is 18240007. The reversal of 18240004 is 40004281.

It can be written as a sum of positive squares in only one way, i.e., 13838400 + 4401604 = 3720^2 + 2098^2 .

It is not an unprimeable number, because it can be changed into a prime (18240007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2279997 + ... + 2280004.

Almost surely, 2^18240004 is an apocalyptic number.

It is an amenable number.

18240004 is a deficient number, since it is larger than the sum of its proper divisors (13680010).

18240004 is a wasteful number, since it uses less digits than its factorization.

18240004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560005 (or 4560003 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 18240004 is about 4270.8317691054. The cubic root of 18240004 is about 263.2337938519.

Adding to 18240004 its reverse (40004281), we get a palindrome (58244285).

It can be divided in two parts, 182 and 40004, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 18240004 in words is "eighteen million, two hundred forty thousand, four".