18274985 has 4 divisors (see below), whose sum is σ = 21929988. Its totient is φ = 14619984.

The previous prime is 18274969. The next prime is 18275011. The reversal of 18274985 is 58947281.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10316944 + 7958041 = 3212^2 + 2821^2 .

It is a cyclic number.

It is not a de Polignac number, because 18274985 - 2⁴ = 18274969 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 1827494 + ... + 1827503.

It is an arithmetic number, because the mean of its divisors is an integer number (5482497).

Almost surely, 2^18274985 is an apocalyptic number.

It is an amenable number.

18274985 is a deficient number, since it is larger than the sum of its proper divisors (3655003).

18274985 is an equidigital number, since it uses as much as digits as its factorization.

18274985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655002.

The product of its digits is 161280, while the sum is 44.

The square root of 18274985 is about 4274.9251455435. The cubic root of 18274985 is about 263.4019645217.

The spelling of 18274985 in words is "eighteen million, two hundred seventy-four thousand, nine hundred eighty-five".