1306439 has 2 divisors, whose sum is σ = 1306440. Its totient is φ = 1306438.

The previous prime is 1306429. The next prime is 1306447. The reversal of 1306439 is 9346031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1306439 - 2²⁰ = 257863 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653219 + 653220.

It is an arithmetic number, because the mean of its divisors is an integer number (653220).

2^1306439 is an apocalyptic number.

1306439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306439 is an equidigital number, since it uses as much as digits as its factorization.

1306439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1306439 is about 1142.9956255384. The cubic root of 1306439 is about 109.3191833843.

The spelling of 1306439 in words is "one million, three hundred six thousand, four hundred thirty-nine".