18090472 has 8 divisors (see below), whose sum is σ = 33919650. Its totient is φ = 9045232.

The previous prime is 18090467. The next prime is 18090491. The reversal of 18090472 is 27409081.

It can be written as a sum of positive squares in only one way, i.e., 11464996 + 6625476 = 3386^2 + 2574^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130647 + ... + 1130662.

Almost surely, 2^18090472 is an apocalyptic number.

It is an amenable number.

18090472 is a deficient number, since it is larger than the sum of its proper divisors (15829178).

18090472 is a wasteful number, since it uses less digits than its factorization.

18090472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261315 (or 2261311 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18090472 is about 4253.2895504539. The cubic root of 18090472 is about 262.5124867832.

The spelling of 18090472 in words is "eighteen million, ninety thousand, four hundred seventy-two".