18442945 has 8 divisors (see below), whose sum is σ = 22412160. Its totient is φ = 14567280.

The previous prime is 18442891. The next prime is 18442967. The reversal of 18442945 is 54924481.

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

It is not a de Polignac number, because 18442945 - 2⁷ = 18442817 is a prime.

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, 22951 + ... + 23740.

It is an arithmetic number, because the mean of its divisors is an integer number (2801520).

Almost surely, 2^18442945 is an apocalyptic number.

It is an amenable number.

18442945 is a deficient number, since it is larger than the sum of its proper divisors (3969215).

18442945 is an equidigital number, since it uses as much as digits as its factorization.

18442945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46775.

The product of its digits is 46080, while the sum is 37.

The square root of 18442945 is about 4294.5250028379. The cubic root of 18442945 is about 264.2064548578.

The spelling of 18442945 in words is "eighteen million, four hundred forty-two thousand, nine hundred forty-five".