18784072 has 16 divisors (see below), whose sum is σ = 35269740. Its totient is φ = 9378816.

The previous prime is 18784037. The next prime is 18784091. The reversal of 18784072 is 27048781.

It can be written as a sum of positive squares in 2 ways, for example, as 14092516 + 4691556 = 3754^2 + 2166^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 7128 + ... + 9400.

Almost surely, 2^18784072 is an apocalyptic number.

It is an amenable number.

18784072 is a deficient number, since it is larger than the sum of its proper divisors (16485668).

18784072 is a wasteful number, since it uses less digits than its factorization.

18784072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312 (or 3308 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 18784072 is about 4334.0595288944. The cubic root of 18784072 is about 265.8254644889.

The spelling of 18784072 in words is "eighteen million, seven hundred eighty-four thousand, seventy-two".