12191742 has 32 divisors (see below), whose sum is σ = 27970560. Its totient is φ = 3932280.

The previous prime is 12191741. The next prime is 12191779. The reversal of 12191742 is 24719121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12191741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1968 + ... + 5315.

It is an arithmetic number, because the mean of its divisors is an integer number (874080).

Almost surely, 2^12191742 is an apocalyptic number.

12191742 is an abundant number, since it is smaller than the sum of its proper divisors (15778818).

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

12191742 is a wasteful number, since it uses less digits than its factorization.

12191742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325 (or 7319 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 12191742 is about 3491.6675099442. The cubic root of 12191742 is about 230.1557986622.

The spelling of 12191742 in words is "twelve million, one hundred ninety-one thousand, seven hundred forty-two".