12491739 has 20 divisors (see below), whose sum is σ = 20097616. Its totient is φ = 7686576.

The previous prime is 12491723. The next prime is 12491741. The reversal of 12491739 is 93719421.

It is not a de Polignac number, because 12491739 - 2⁴ = 12491723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12491789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4879 + ... + 6984.

Almost surely, 2^12491739 is an apocalyptic number.

12491739 is a deficient number, since it is larger than the sum of its proper divisors (7605877).

12491739 is a wasteful number, since it uses less digits than its factorization.

12491739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11888 (or 11879 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 12491739 is about 3534.3654310215. The cubic root of 12491739 is about 232.0283048601.

The spelling of 12491739 in words is "twelve million, four hundred ninety-one thousand, seven hundred thirty-nine".