12740839 has 4 divisors (see below), whose sum is σ = 13085224. Its totient is φ = 12396456.

The previous prime is 12740809. The next prime is 12740867. The reversal of 12740839 is 93804721.

12740839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93804721 = 5309 ⋅17669.

It is a cyclic number.

It is not a de Polignac number, because 12740839 - 2⁷ = 12740711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12740809) 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, 172137 + ... + 172210.

It is an arithmetic number, because the mean of its divisors is an integer number (3271306).

Almost surely, 2^12740839 is an apocalyptic number.

12740839 is a deficient number, since it is larger than the sum of its proper divisors (344385).

12740839 is an equidigital number, since it uses as much as digits as its factorization.

12740839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344384.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 12740839 is about 3569.4311871781. The cubic root of 12740839 is about 233.5604711118.

The spelling of 12740839 in words is "twelve million, seven hundred forty thousand, eight hundred thirty-nine".