18316945 has 8 divisors (see below), whose sum is σ = 22023144. Its totient is φ = 14625024.

The previous prime is 18316927. The next prime is 18316957. The reversal of 18316945 is 54961381.

It can be written as a sum of positive squares in 4 ways, for example, as 3083536 + 15233409 = 1756^2 + 3903^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18316945 - 2¹³ = 18308753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504 + ... + 6073.

It is an arithmetic number, because the mean of its divisors is an integer number (2752893).

Almost surely, 2^18316945 is an apocalyptic number.

It is an amenable number.

18316945 is a deficient number, since it is larger than the sum of its proper divisors (3706199).

18316945 is an equidigital number, since it uses as much as digits as its factorization.

18316945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139.

The product of its digits is 25920, while the sum is 37.

The square root of 18316945 is about 4279.8300199891. The cubic root of 18316945 is about 263.6034037814.

The spelling of 18316945 in words is "eighteen million, three hundred sixteen thousand, nine hundred forty-five".