18318845 has 8 divisors (see below), whose sum is σ = 22033464. Its totient is φ = 14621184.

The previous prime is 18318827. The next prime is 18318857. The reversal of 18318845 is 54881381.

It can be written as a sum of positive squares in 4 ways, for example, as 5257849 + 13060996 = 2293^2 + 3614^2 .

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 18318845 - 2¹² = 18314749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18318799 and 18318808.

It is a congruent 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, 1724 + ... + 6293.

It is an arithmetic number, because the mean of its divisors is an integer number (2754183).

Almost surely, 2^18318845 is an apocalyptic number.

It is an amenable number.

18318845 is a deficient number, since it is larger than the sum of its proper divisors (3714619).

18318845 is an equidigital number, since it uses as much as digits as its factorization.

18318845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8479.

The product of its digits is 30720, while the sum is 38.

The square root of 18318845 is about 4280.0519856656. The cubic root of 18318845 is about 263.6125179131.

The spelling of 18318845 in words is "eighteen million, three hundred eighteen thousand, eight hundred forty-five".