12397861 has 24 divisors (see below), whose sum is σ = 15570240. Its totient is φ = 9642240.

The previous prime is 12397859. The next prime is 12397871. The reversal of 12397861 is 16879321.

It is not a de Polignac number, because 12397861 - 2¹ = 12397859 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 12397861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12397841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127765 + ... + 127861.

It is an arithmetic number, because the mean of its divisors is an integer number (648760).

Almost surely, 2^12397861 is an apocalyptic number.

It is an amenable number.

12397861 is a deficient number, since it is larger than the sum of its proper divisors (3172379).

12397861 is an equidigital number, since it uses as much as digits as its factorization.

12397861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 154 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 12397861 is about 3521.0596416420. The cubic root of 12397861 is about 231.4455958002.

The spelling of 12397861 in words is "twelve million, three hundred ninety-seven thousand, eight hundred sixty-one".