318672993 has 4 divisors (see below), whose sum is σ = 424897328. Its totient is φ = 212448660.

The previous prime is 318672989. The next prime is 318673001. The reversal of 318672993 is 399276813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 318672993 - 2² = 318672989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318672593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53112163 + ... + 53112168.

It is an arithmetic number, because the mean of its divisors is an integer number (106224332).

Almost surely, 2^318672993 is an apocalyptic number.

It is an amenable number.

318672993 is a deficient number, since it is larger than the sum of its proper divisors (106224335).

318672993 is a wasteful number, since it uses less digits than its factorization.

318672993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106224334.

The product of its digits is 489888, while the sum is 48.

The square root of 318672993 is about 17851.4143137176. The cubic root of 318672993 is about 683.0435895285.

The spelling of 318672993 in words is "three hundred eighteen million, six hundred seventy-two thousand, nine hundred ninety-three".