18072745 has 8 divisors (see below), whose sum is σ = 21886920. Its totient is φ = 14325120.

The previous prime is 18072739. The next prime is 18072763. The reversal of 18072745 is 54727081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7601049 + 10471696 = 2757^2 + 3236^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18072745 - 2²³ = 9684137 is a prime.

It is a super-2 number, since 2×18072745² = 653248223670050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18072745.

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 7 ways as a sum of consecutive naturals, for example, 16036 + ... + 17125.

It is an arithmetic number, because the mean of its divisors is an integer number (2735865).

Almost surely, 2^18072745 is an apocalyptic number.

It is an amenable number.

18072745 is a deficient number, since it is larger than the sum of its proper divisors (3814175).

18072745 is a wasteful number, since it uses less digits than its factorization.

18072745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33275.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 18072745 is about 4251.2051232562. The cubic root of 18072745 is about 262.4267127230.

The spelling of 18072745 in words is "eighteen million, seventy-two thousand, seven hundred forty-five".