18198472 has 8 divisors (see below), whose sum is σ = 34122150. Its totient is φ = 9099232.

The previous prime is 18198469. The next prime is 18198493. The reversal of 18198472 is 27489181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 1503076 = 4086^2 + 1226^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1137397 + ... + 1137412.

Almost surely, 2^18198472 is an apocalyptic number.

It is an amenable number.

18198472 is a deficient number, since it is larger than the sum of its proper divisors (15923678).

18198472 is a wasteful number, since it uses less digits than its factorization.

18198472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274815 (or 2274811 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 18198472 is about 4265.9667134191. The cubic root of 18198472 is about 263.0338499227.

The spelling of 18198472 in words is "eighteen million, one hundred ninety-eight thousand, four hundred seventy-two".