312005 has 4 divisors (see below), whose sum is σ = 374412. Its totient is φ = 249600.

The previous prime is 311981. The next prime is 312007. The reversal of 312005 is 500213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 228484 + 83521 = 478^2 + 289^2 .

It is not a de Polignac number, because 312005 - 2⁸ = 311749 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 (312007) 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, 31196 + ... + 31205.

It is an arithmetic number, because the mean of its divisors is an integer number (93603).

2³¹²⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

312005 is a deficient number, since it is larger than the sum of its proper divisors (62407).

312005 is an equidigital number, since it uses as much as digits as its factorization.

312005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62406.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 312005 is about 558.5740774508. The cubic root of 312005 is about 67.8245911673.

Adding to 312005 its reverse (500213), we get a palindrome (812218).

The spelling of 312005 in words is "three hundred twelve thousand, five".