12397771 has 2 divisors, whose sum is σ = 12397772. Its totient is φ = 12397770.

The previous prime is 12397753. The next prime is 12397787. The reversal of 12397771 is 17779321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12397771 - 2⁵ = 12397739 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12397771.

It is not a weakly prime, because it can be changed into another prime (12397711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6198885 + 6198886.

It is an arithmetic number, because the mean of its divisors is an integer number (6198886).

Almost surely, 2^12397771 is an apocalyptic number.

12397771 is a deficient number, since it is larger than the sum of its proper divisors (1).

12397771 is an equidigital number, since it uses as much as digits as its factorization.

12397771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18522, while the sum is 37.

The square root of 12397771 is about 3521.0468613752. The cubic root of 12397771 is about 231.4450357532.

It can be divided in two parts, 1239 and 7771, that multiplied together give a palindrome (9628269).

The spelling of 12397771 in words is "twelve million, three hundred ninety-seven thousand, seven hundred seventy-one".