12566397 has 4 divisors (see below), whose sum is σ = 16755200. Its totient is φ = 8377596.

The previous prime is 12566369. The next prime is 12566419. The reversal of 12566397 is 79366521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12566397 - 2¹⁵ = 12533629 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 (12566327) 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, 2094397 + ... + 2094402.

It is an arithmetic number, because the mean of its divisors is an integer number (4188800).

Almost surely, 2^12566397 is an apocalyptic number.

It is an amenable number.

12566397 is a deficient number, since it is larger than the sum of its proper divisors (4188803).

12566397 is an equidigital number, since it uses as much as digits as its factorization.

12566397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188802.

The product of its digits is 68040, while the sum is 39.

The square root of 12566397 is about 3544.9114234350. The cubic root of 12566397 is about 232.4896330214.

The spelling of 12566397 in words is "twelve million, five hundred sixty-six thousand, three hundred ninety-seven".