312775 has 6 divisors (see below), whose sum is σ = 387872. Its totient is φ = 250200.

The previous prime is 312773. The next prime is 312779. The reversal of 312775 is 577213.

It is not a de Polignac number, because 312775 - 2¹ = 312773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 12511 = 312775 / (3 + 1 + 2 + 7 + 7 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6231 + ... + 6280.

2³¹²⁷⁷⁵ is an apocalyptic number.

312775 is a deficient number, since it is larger than the sum of its proper divisors (75097).

312775 is a wasteful number, since it uses less digits than its factorization.

312775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12521 (or 12516 counting only the distinct ones).

The product of its digits is 1470, while the sum is 25.

The square root of 312775 is about 559.2629077634. The cubic root of 312775 is about 67.8803403079.

Adding to 312775 its reverse (577213), we get a palindrome (889988).

The spelling of 312775 in words is "three hundred twelve thousand, seven hundred seventy-five".