12187397 has 4 divisors (see below), whose sum is σ = 12202476. Its totient is φ = 12172320.

The previous prime is 12187391. The next prime is 12187421. The reversal of 12187397 is 79378121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79378121 = 89 ⋅891889.

It can be written as a sum of positive squares in 2 ways, for example, as 10023556 + 2163841 = 3166^2 + 1471^2 .

It is a cyclic number.

It is not a de Polignac number, because 12187397 - 2²⁰ = 11138821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12187397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12187391) 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, 6254 + ... + 7967.

It is an arithmetic number, because the mean of its divisors is an integer number (3050619).

Almost surely, 2^12187397 is an apocalyptic number.

It is an amenable number.

12187397 is a deficient number, since it is larger than the sum of its proper divisors (15079).

12187397 is an equidigital number, since it uses as much as digits as its factorization.

12187397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078.

The product of its digits is 21168, while the sum is 38.

The square root of 12187397 is about 3491.0452589447. The cubic root of 12187397 is about 230.1284537658.

The spelling of 12187397 in words is "twelve million, one hundred eighty-seven thousand, three hundred ninety-seven".