12191956 has 12 divisors (see below), whose sum is σ = 24383968. Its totient is φ = 5225112.

The previous prime is 12191947. The next prime is 12192017. The reversal of 12191956 is 65919121.

It is a happy number.

12191956 is an admirable number.

It is a super-2 number, since 2×12191956² = 297287582211872, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217686 + ... + 217741.

Almost surely, 2^12191956 is an apocalyptic number.

It is an amenable number.

12191956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12191956 is a wasteful number, since it uses less digits than its factorization.

12191956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435438 (or 435436 counting only the distinct ones).

The product of its digits is 4860, while the sum is 34.

The square root of 12191956 is about 3491.6981541937. The cubic root of 12191956 is about 230.1571452856.

The spelling of 12191956 in words is "twelve million, one hundred ninety-one thousand, nine hundred fifty-six".