18222472 has 8 divisors (see below), whose sum is σ = 34167150. Its totient is φ = 9111232.

The previous prime is 18222461. The next prime is 18222473. The reversal of 18222472 is 27422281.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 23716 = 4266^2 + 154^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18222472.

It is not an unprimeable number, because it can be changed into a prime (18222473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1138897 + ... + 1138912.

Almost surely, 2^18222472 is an apocalyptic number.

It is an amenable number.

18222472 is a deficient number, since it is larger than the sum of its proper divisors (15944678).

18222472 is a wasteful number, since it uses less digits than its factorization.

18222472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277815 (or 2277811 counting only the distinct ones).

The product of its digits is 3584, while the sum is 28.

The square root of 18222472 is about 4268.7787480730. The cubic root of 18222472 is about 263.1494281122.

The spelling of 18222472 in words is "eighteen million, two hundred twenty-two thousand, four hundred seventy-two".