18085747 has 4 divisors (see below), whose sum is σ = 18272296. Its totient is φ = 17899200.

The previous prime is 18085709. The next prime is 18085787. The reversal of 18085747 is 74758081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74758081 = 31 ⋅2411551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18085747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18085787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93129 + ... + 93322.

It is an arithmetic number, because the mean of its divisors is an integer number (4568074).

Almost surely, 2^18085747 is an apocalyptic number.

18085747 is a deficient number, since it is larger than the sum of its proper divisors (186549).

18085747 is an equidigital number, since it uses as much as digits as its factorization.

18085747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186548.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 18085747 is about 4252.7340617537. The cubic root of 18085747 is about 262.4896298246.

The spelling of 18085747 in words is "eighteen million, eighty-five thousand, seven hundred forty-seven".