12191927 has 4 divisors (see below), whose sum is σ = 13300296. Its totient is φ = 11083560.

The previous prime is 12191917. The next prime is 12191947. The reversal of 12191927 is 72919121.

12191927 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12191927 - 2¹⁰ = 12190903 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12191893 and 12191902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12191917) 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, 554168 + ... + 554189.

It is an arithmetic number, because the mean of its divisors is an integer number (3325074).

Almost surely, 2^12191927 is an apocalyptic number.

12191927 is a deficient number, since it is larger than the sum of its proper divisors (1108369).

12191927 is a wasteful number, since it uses less digits than its factorization.

12191927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108368.

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

The square root of 12191927 is about 3491.6940014841. The cubic root of 12191927 is about 230.1569628001.

The spelling of 12191927 in words is "twelve million, one hundred ninety-one thousand, nine hundred twenty-seven".