12491439 has 4 divisors (see below), whose sum is σ = 16655256. Its totient is φ = 8327624.

The previous prime is 12491399. The next prime is 12491443. The reversal of 12491439 is 93419421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93419421 = 3 ⋅31139807.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12491439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491449) 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, 2081904 + ... + 2081909.

It is an arithmetic number, because the mean of its divisors is an integer number (4163814).

Almost surely, 2^12491439 is an apocalyptic number.

12491439 is a deficient number, since it is larger than the sum of its proper divisors (4163817).

12491439 is an equidigital number, since it uses as much as digits as its factorization.

12491439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4163816.

The product of its digits is 7776, while the sum is 33.

The square root of 12491439 is about 3534.3229903335. The cubic root of 12491439 is about 232.0264473912.

The spelling of 12491439 in words is "twelve million, four hundred ninety-one thousand, four hundred thirty-nine".