18940004 has 12 divisors (see below), whose sum is σ = 34041084. Its totient is φ = 9213984.

The previous prime is 18939997. The next prime is 18940007. The reversal of 18940004 is 40004981.

It can be written as a sum of positive squares in 2 ways, for example, as 16974400 + 1965604 = 4120^2 + 1402^2 .

It is not an unprimeable number, because it can be changed into a prime (18940007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63839 + ... + 64134.

It is an arithmetic number, because the mean of its divisors is an integer number (2836757).

Almost surely, 2^18940004 is an apocalyptic number.

It is an amenable number.

18940004 is a deficient number, since it is larger than the sum of its proper divisors (15101080).

18940004 is a wasteful number, since it uses less digits than its factorization.

18940004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128014 (or 128012 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18940004 is about 4352.0114889554. The cubic root of 18940004 is about 266.5590030657.

Adding to 18940004 its reverse (40004981), we get a palindrome (58944985).

The spelling of 18940004 in words is "eighteen million, nine hundred forty thousand, four".