317978939 has 4 divisors (see below), whose sum is σ = 328943760. Its totient is φ = 307014120.

The previous prime is 317978929. The next prime is 317978951. The reversal of 317978939 is 939879713.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317978939 is a prime.

It is a super-2 number, since 2×317978939² = 202221211295131442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (317978929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5482367 + ... + 5482424.

It is an arithmetic number, because the mean of its divisors is an integer number (82235940).

Almost surely, 2^317978939 is an apocalyptic number.

317978939 is a deficient number, since it is larger than the sum of its proper divisors (10964821).

317978939 is a wasteful number, since it uses less digits than its factorization.

317978939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10964820.

The product of its digits is 2571912, while the sum is 56.

The square root of 317978939 is about 17831.9639692323. The cubic root of 317978939 is about 682.5473507202.

The spelling of 317978939 in words is "three hundred seventeen million, nine hundred seventy-eight thousand, nine hundred thirty-nine".