12491729 has 8 divisors (see below), whose sum is σ = 13139712. Its totient is φ = 11859120.

The previous prime is 12491723. The next prime is 12491741. The reversal of 12491729 is 92719421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12491729 - 2²⁰ = 11443153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12491723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2159 + ... + 5444.

It is an arithmetic number, because the mean of its divisors is an integer number (1642464).

Almost surely, 2^12491729 is an apocalyptic number.

It is an amenable number.

12491729 is a deficient number, since it is larger than the sum of its proper divisors (647983).

12491729 is an equidigital number, since it uses as much as digits as its factorization.

12491729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7687.

The product of its digits is 9072, while the sum is 35.

The square root of 12491729 is about 3534.3640163401. The cubic root of 12491729 is about 232.0282429449.

The spelling of 12491729 in words is "twelve million, four hundred ninety-one thousand, seven hundred twenty-nine".