312638 has 4 divisors (see below), whose sum is σ = 468960. Its totient is φ = 156318.

The previous prime is 312623. The next prime is 312643. The reversal of 312638 is 836213.

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

It is a congruent number.

It is an unprimeable number.

312638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78158 + ... + 78161.

It is an arithmetic number, because the mean of its divisors is an integer number (117240).

2³¹²⁶³⁸ is an apocalyptic number.

312638 is a deficient number, since it is larger than the sum of its proper divisors (156322).

312638 is a wasteful number, since it uses less digits than its factorization.

312638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156321.

The product of its digits is 864, while the sum is 23.

The square root of 312638 is about 559.1404117035. The cubic root of 312638 is about 67.8704280017.

The spelling of 312638 in words is "three hundred twelve thousand, six hundred thirty-eight".