18222404 has 6 divisors (see below), whose sum is σ = 31889214. Its totient is φ = 9111200.

The previous prime is 18222367. The next prime is 18222427. The reversal of 18222404 is 40422281.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10549504 + 7672900 = 3248^2 + 2770^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18222404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277797 + ... + 2277804.

It is an arithmetic number, because the mean of its divisors is an integer number (5314869).

Almost surely, 2^18222404 is an apocalyptic number.

It is an amenable number.

18222404 is a deficient number, since it is larger than the sum of its proper divisors (13666810).

18222404 is a wasteful number, since it uses less digits than its factorization.

18222404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555605 (or 4555603 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18222404 is about 4268.7707832583. The cubic root of 18222404 is about 263.1491007840.

Adding to 18222404 its reverse (40422281), we get a palindrome (58644685).

The spelling of 18222404 in words is "eighteen million, two hundred twenty-two thousand, four hundred four".