18313318 has 16 divisors (see below), whose sum is σ = 29171664. Its totient is φ = 8592640.

The previous prime is 18313307. The next prime is 18313327. The reversal of 18313318 is 81331381.

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, 16146 + ... + 17242.

It is an arithmetic number, because the mean of its divisors is an integer number (1823229).

Almost surely, 2^18313318 is an apocalyptic number.

18313318 is a deficient number, since it is larger than the sum of its proper divisors (10858346).

18313318 is a wasteful number, since it uses less digits than its factorization.

18313318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607.

The product of its digits is 1728, while the sum is 28.

The square root of 18313318 is about 4279.4062672291. The cubic root of 18313318 is about 263.5860036334.

Adding to 18313318 its reverse (81331381), we get a palindrome (99644699).

The spelling of 18313318 in words is "eighteen million, three hundred thirteen thousand, three hundred eighteen".