313968639 has 4 divisors (see below), whose sum is σ = 418624856. Its totient is φ = 209312424.

The previous prime is 313968619. The next prime is 313968649. The reversal of 313968639 is 936869313.

It is a happy number.

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

It is not a de Polignac number, because 313968639 - 2¹³ = 313960447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313968619) 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, 52328104 + ... + 52328109.

It is an arithmetic number, because the mean of its divisors is an integer number (104656214).

Almost surely, 2^313968639 is an apocalyptic number.

313968639 is a deficient number, since it is larger than the sum of its proper divisors (104656217).

313968639 is a wasteful number, since it uses less digits than its factorization.

313968639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104656216.

The product of its digits is 629856, while the sum is 48.

The square root of 313968639 is about 17719.1602227645. The cubic root of 313968639 is about 679.6658096912.

The spelling of 313968639 in words is "three hundred thirteen million, nine hundred sixty-eight thousand, six hundred thirty-nine".