12931439 has 8 divisors (see below), whose sum is σ = 13391040. Its totient is φ = 12479616.

The previous prime is 12931427. The next prime is 12931453. The reversal of 12931439 is 93413921.

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 12931439 - 2⁴ = 12931423 is a prime.

It is a super-2 number, since 2×12931439² = 334444229221442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12931409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1547 + ... + 5315.

It is an arithmetic number, because the mean of its divisors is an integer number (1673880).

Almost surely, 2^12931439 is an apocalyptic number.

12931439 is a deficient number, since it is larger than the sum of its proper divisors (459601).

12931439 is an equidigital number, since it uses as much as digits as its factorization.

12931439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3889.

The product of its digits is 5832, while the sum is 32.

The square root of 12931439 is about 3596.0310065404. The cubic root of 12931439 is about 234.7193813526.

The spelling of 12931439 in words is "twelve million, nine hundred thirty-one thousand, four hundred thirty-nine".