18222004 has 6 divisors (see below), whose sum is σ = 31888514. Its totient is φ = 9111000.

The previous prime is 18221989. The next prime is 18222013. The reversal of 18222004 is 40022281.

It can be written as a sum of positive squares in only one way, i.e., 15194404 + 3027600 = 3898^2 + 1740^2 .

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 as a sum of consecutive naturals, namely, 2277747 + ... + 2277754.

Almost surely, 2^18222004 is an apocalyptic number.

It is an amenable number.

18222004 is a deficient number, since it is larger than the sum of its proper divisors (13666510).

18222004 is a wasteful number, since it uses less digits than its factorization.

18222004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555505 (or 4555503 counting only the distinct ones).

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

The square root of 18222004 is about 4268.7239311063. The cubic root of 18222004 is about 263.1471753079.

Adding to 18222004 its reverse (40022281), we get a palindrome (58244285).

The spelling of 18222004 in words is "eighteen million, two hundred twenty-two thousand, four".