18071072 has 24 divisors (see below), whose sum is σ = 35673372. Its totient is φ = 9011200.

The previous prime is 18070999. The next prime is 18071087. The reversal of 18071072 is 27017081.

It can be written as a sum of positive squares in 2 ways, for example, as 18011536 + 59536 = 4244^2 + 244^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20072 + ... + 20952.

Almost surely, 2^18071072 is an apocalyptic number.

It is an amenable number.

18071072 is a deficient number, since it is larger than the sum of its proper divisors (17602300).

18071072 is an equidigital number, since it uses as much as digits as its factorization.

18071072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 18071072 is about 4251.0083509680. The cubic root of 18071072 is about 262.4186148305.

The spelling of 18071072 in words is "eighteen million, seventy-one thousand, seventy-two".