12391743 has 32 divisors (see below), whose sum is σ = 21414400. Its totient is φ = 6189696.

The previous prime is 12391739. The next prime is 12391747. The reversal of 12391743 is 34719321.

It is an interprime number because it is at equal distance from previous prime (12391739) and next prime (12391747).

It is not a de Polignac number, because 12391743 - 2² = 12391739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12391743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12391747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3993 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (669200).

Almost surely, 2^12391743 is an apocalyptic number.

12391743 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12391743 is a deficient number, since it is larger than the sum of its proper divisors (9022657).

12391743 is a wasteful number, since it uses less digits than its factorization.

12391743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431.

The product of its digits is 4536, while the sum is 30.

The square root of 12391743 is about 3520.1907618764. The cubic root of 12391743 is about 231.4075188788.

The spelling of 12391743 in words is "twelve million, three hundred ninety-one thousand, seven hundred forty-three".