12191972 has 12 divisors (see below), whose sum is σ = 22977276. Its totient is φ = 5627040.

The previous prime is 12191947. The next prime is 12192017. The reversal of 12191972 is 27919121.

It can be written as a sum of positive squares in 2 ways, for example, as 6120676 + 6071296 = 2474^2 + 2464^2 .

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, 117179 + ... + 117282.

It is an arithmetic number, because the mean of its divisors is an integer number (1914773).

Almost surely, 2^12191972 is an apocalyptic number.

It is an amenable number.

12191972 is a deficient number, since it is larger than the sum of its proper divisors (10785304).

12191972 is a wasteful number, since it uses less digits than its factorization.

12191972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234478 (or 234476 counting only the distinct ones).

The product of its digits is 2268, while the sum is 32.

The square root of 12191972 is about 3491.7004453418. The cubic root of 12191972 is about 230.1572459670.

The spelling of 12191972 in words is "twelve million, one hundred ninety-one thousand, nine hundred seventy-two".