312397 has 2 divisors, whose sum is σ = 312398. Its totient is φ = 312396.

The previous prime is 312383. The next prime is 312401. The reversal of 312397 is 793213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276676 + 35721 = 526^2 + 189^2 .

It is a cyclic number.

It is not a de Polignac number, because 312397 - 2⁷ = 312269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156198 + 156199.

It is an arithmetic number, because the mean of its divisors is an integer number (156199).

2³¹²³⁹⁷ is an apocalyptic number.

It is an amenable number.

312397 is a deficient number, since it is larger than the sum of its proper divisors (1).

312397 is an equidigital number, since it uses as much as digits as its factorization.

312397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 25.

The square root of 312397 is about 558.9248607818. The cubic root of 312397 is about 67.8529839952.

The spelling of 312397 in words is "three hundred twelve thousand, three hundred ninety-seven".