12817439 has 6 divisors (see below), whose sum is σ = 13616064. Its totient is φ = 12063200.

The previous prime is 12817421. The next prime is 12817459. The reversal of 12817439 is 93471821.

12817439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12817439 - 2¹² = 12813343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12817399 and 12817408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12817459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21887 + ... + 22464.

It is an arithmetic number, because the mean of its divisors is an integer number (2269344).

Almost surely, 2^12817439 is an apocalyptic number.

12817439 is a deficient number, since it is larger than the sum of its proper divisors (798625).

12817439 is an equidigital number, since it uses as much as digits as its factorization.

12817439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44385 (or 44368 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 12817439 is about 3580.1451087910. The cubic root of 12817439 is about 234.0276040681.

The spelling of 12817439 in words is "twelve million, eight hundred seventeen thousand, four hundred thirty-nine".