312938639 has 4 divisors (see below), whose sum is σ = 337010856. Its totient is φ = 288866424.

The previous prime is 312938611. The next prime is 312938657. The reversal of 312938639 is 936839213.

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

It is a cyclic number.

It is not a de Polignac number, because 312938639 - 2¹² = 312934543 is a prime.

It is a super-3 number, since 3×312938639³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 312938639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312938239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12036089 + ... + 12036114.

It is an arithmetic number, because the mean of its divisors is an integer number (84252714).

Almost surely, 2^312938639 is an apocalyptic number.

312938639 is a deficient number, since it is larger than the sum of its proper divisors (24072217).

312938639 is a wasteful number, since it uses less digits than its factorization.

312938639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24072216.

The product of its digits is 209952, while the sum is 44.

The square root of 312938639 is about 17690.0717635627. The cubic root of 312938639 is about 678.9217622234.

The spelling of 312938639 in words is "three hundred twelve million, nine hundred thirty-eight thousand, six hundred thirty-nine".