312139943 has 4 divisors (see below), whose sum is σ = 313267080. Its totient is φ = 311012808.

The previous prime is 312139937. The next prime is 312139973. The reversal of 312139943 is 349931213.

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 312139943 - 2¹² = 312135847 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 (312139903) 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, 563153 + ... + 563706.

It is an arithmetic number, because the mean of its divisors is an integer number (78316770).

Almost surely, 2^312139943 is an apocalyptic number.

312139943 is a deficient number, since it is larger than the sum of its proper divisors (1127137).

312139943 is a wasteful number, since it uses less digits than its factorization.

312139943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127136.

The product of its digits is 17496, while the sum is 35.

The square root of 312139943 is about 17667.4826446780. The cubic root of 312139943 is about 678.3436786383.

The spelling of 312139943 in words is "three hundred twelve million, one hundred thirty-nine thousand, nine hundred forty-three".