12397689 has 12 divisors (see below), whose sum is σ = 17976036. Its totient is φ = 8233632.

The previous prime is 12397687. The next prime is 12397691. The reversal of 12397689 is 98679321.

It is an interprime number because it is at equal distance from previous prime (12397687) and next prime (12397691).

It can be written as a sum of positive squares in 2 ways, for example, as 4928400 + 7469289 = 2220^2 + 2733^2 .

It is not a de Polignac number, because 12397689 - 2¹ = 12397687 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (12397681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7 + ... + 4979.

It is an arithmetic number, because the mean of its divisors is an integer number (1498003).

Almost surely, 2^12397689 is an apocalyptic number.

It is an amenable number.

12397689 is a deficient number, since it is larger than the sum of its proper divisors (5578347).

12397689 is a wasteful number, since it uses less digits than its factorization.

12397689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5256 (or 5253 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 12397689 is about 3521.0352170917. The cubic root of 12397689 is about 231.4445254858. Note that the first 3 decimals are identical.

The spelling of 12397689 in words is "twelve million, three hundred ninety-seven thousand, six hundred eighty-nine".