1312739 has 2 divisors, whose sum is σ = 1312740. Its totient is φ = 1312738.

The previous prime is 1312733. The next prime is 1312769. The reversal of 1312739 is 9372131.

It is a weak prime.

It is an emirp because it is prime and its reverse (9372131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312739 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1312733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656369 + 656370.

It is an arithmetic number, because the mean of its divisors is an integer number (656370).

2^1312739 is an apocalyptic number.

1312739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312739 is an equidigital number, since it uses as much as digits as its factorization.

1312739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 26.

The square root of 1312739 is about 1145.7482271424. The cubic root of 1312739 is about 109.4946238404.

The spelling of 1312739 in words is "one million, three hundred twelve thousand, seven hundred thirty-nine".