18618313 has 8 divisors (see below), whose sum is σ = 21373632. Its totient is φ = 15886896.

The previous prime is 18618307. The next prime is 18618323. The reversal of 18618313 is 31381681.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18618313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18618323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4270 + ... + 7447.

It is an arithmetic number, because the mean of its divisors is an integer number (2671704).

Almost surely, 2^18618313 is an apocalyptic number.

It is an amenable number.

18618313 is a deficient number, since it is larger than the sum of its proper divisors (2755319).

18618313 is a wasteful number, since it uses less digits than its factorization.

18618313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11951.

The product of its digits is 3456, while the sum is 31.

The square root of 18618313 is about 4314.8943208380. The cubic root of 18618313 is about 265.0412324592.

Adding to 18618313 its reverse (31381681), we get a palindrome (49999994).

The spelling of 18618313 in words is "eighteen million, six hundred eighteen thousand, three hundred thirteen".