312639983 has 4 divisors (see below), whose sum is σ = 315561960. Its totient is φ = 309718008.

The previous prime is 312639961. The next prime is 312640019. The reversal of 312639983 is 389936213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389936213 = 269 ⋅1449577.

It is a cyclic number.

It is not a de Polignac number, because 312639983 - 2¹² = 312635887 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 (312639953) 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, 1460828 + ... + 1461041.

It is an arithmetic number, because the mean of its divisors is an integer number (78890490).

Almost surely, 2^312639983 is an apocalyptic number.

312639983 is a deficient number, since it is larger than the sum of its proper divisors (2921977).

312639983 is a wasteful number, since it uses less digits than its factorization.

312639983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921976.

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

The square root of 312639983 is about 17681.6284035153. The cubic root of 312639983 is about 678.7057149753.

The spelling of 312639983 in words is "three hundred twelve million, six hundred thirty-nine thousand, nine hundred eighty-three".