18447085 has 4 divisors (see below), whose sum is σ = 22136508. Its totient is φ = 14757664.

The previous prime is 18447061. The next prime is 18447109. The reversal of 18447085 is 58074481.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18447061) and next prime (18447109).

It can be written as a sum of positive squares in 2 ways, for example, as 6260004 + 12187081 = 2502^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 18447085 - 2¹⁵ = 18414317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844704 + ... + 1844713.

It is an arithmetic number, because the mean of its divisors is an integer number (5534127).

Almost surely, 2^18447085 is an apocalyptic number.

It is an amenable number.

18447085 is a deficient number, since it is larger than the sum of its proper divisors (3689423).

18447085 is an equidigital number, since it uses as much as digits as its factorization.

18447085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689422.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 18447085 is about 4295.0069848604. The cubic root of 18447085 is about 264.2262227218.

The spelling of 18447085 in words is "eighteen million, four hundred forty-seven thousand, eighty-five".