12195391 has 4 divisors (see below), whose sum is σ = 13133512. Its totient is φ = 11257272.

The previous prime is 12195389. The next prime is 12195401. The reversal of 12195391 is 19359121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12195391 - 2¹ = 12195389 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 (12195301) 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, 469041 + ... + 469066.

It is an arithmetic number, because the mean of its divisors is an integer number (3283378).

Almost surely, 2^12195391 is an apocalyptic number.

12195391 is a deficient number, since it is larger than the sum of its proper divisors (938121).

12195391 is an equidigital number, since it uses as much as digits as its factorization.

12195391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938120.

The product of its digits is 2430, while the sum is 31.

The square root of 12195391 is about 3492.1900005584. The cubic root of 12195391 is about 230.1787583217.

The spelling of 12195391 in words is "twelve million, one hundred ninety-five thousand, three hundred ninety-one".