12857739 has 4 divisors (see below), whose sum is σ = 17143656. Its totient is φ = 8571824.

The previous prime is 12857711. The next prime is 12857771. The reversal of 12857739 is 93775821.

12857739 is digitally balanced in base 3, 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.

It is a cyclic number.

It is not a de Polignac number, because 12857739 - 2¹⁵ = 12824971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12857739.

It is not an unprimeable number, because it can be changed into a prime (12857239) 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, 2142954 + ... + 2142959.

It is an arithmetic number, because the mean of its divisors is an integer number (4285914).

Almost surely, 2^12857739 is an apocalyptic number.

12857739 is a deficient number, since it is larger than the sum of its proper divisors (4285917).

12857739 is an equidigital number, since it uses as much as digits as its factorization.

12857739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4285916.

The product of its digits is 105840, while the sum is 42.

The square root of 12857739 is about 3585.7689551894. The cubic root of 12857739 is about 234.2726203873.

The spelling of 12857739 in words is "twelve million, eight hundred fifty-seven thousand, seven hundred thirty-nine".