12397791 has 16 divisors (see below), whose sum is σ = 18950400. Its totient is φ = 7062528.

The previous prime is 12397787. The next prime is 12397817. The reversal of 12397791 is 19779321.

It is not a de Polignac number, because 12397791 - 2² = 12397787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12397711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8095 + ... + 9503.

It is an arithmetic number, because the mean of its divisors is an integer number (1184400).

Almost surely, 2^12397791 is an apocalyptic number.

12397791 is a deficient number, since it is larger than the sum of its proper divisors (6552609).

12397791 is a wasteful number, since it uses less digits than its factorization.

12397791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838.

The product of its digits is 23814, while the sum is 39.

The square root of 12397791 is about 3521.0497014385. The cubic root of 12397791 is about 231.4451602083.

The spelling of 12397791 in words is "twelve million, three hundred ninety-seven thousand, seven hundred ninety-one".