12311397 has 18 divisors (see below), whose sum is σ = 20687238. Its totient is φ = 7034832.

The previous prime is 12311389. The next prime is 12311401. The reversal of 12311397 is 79311321.

It can be written as a sum of positive squares in only one way, i.e., 12152196 + 159201 = 3486^2 + 399^2 .

It is not a de Polignac number, because 12311397 - 2³ = 12311389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12311397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311347) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13518 + ... + 14399.

It is an arithmetic number, because the mean of its divisors is an integer number (1149291).

Almost surely, 2^12311397 is an apocalyptic number.

It is an amenable number.

12311397 is a deficient number, since it is larger than the sum of its proper divisors (8375841).

12311397 is a wasteful number, since it uses less digits than its factorization.

12311397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27937 (or 27927 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 12311397 is about 3508.7600373921. The cubic root of 12311397 is about 230.9062980844.

It can be divided in two parts, 1231 and 1397, that added together give a triangular number (2628 = T₇₂).

The spelling of 12311397 in words is "twelve million, three hundred eleven thousand, three hundred ninety-seven".