18166449 has 8 divisors (see below), whose sum is σ = 27682240. Its totient is φ = 10380816.

The previous prime is 18166433. The next prime is 18166453. The reversal of 18166449 is 94466181.

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

It is not a de Polignac number, because 18166449 - 2⁴ = 18166433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18166429) by changing a digit.

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, 432514 + ... + 432555.

It is an arithmetic number, because the mean of its divisors is an integer number (3460280).

Almost surely, 2^18166449 is an apocalyptic number.

It is an amenable number.

18166449 is a deficient number, since it is larger than the sum of its proper divisors (9515791).

18166449 is an equidigital number, since it uses as much as digits as its factorization.

18166449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865079.

The product of its digits is 41472, while the sum is 39.

The square root of 18166449 is about 4262.2117497844. The cubic root of 18166449 is about 262.8794765517.

The spelling of 18166449 in words is "eighteen million, one hundred sixty-six thousand, four hundred forty-nine".