1256939 has 2 divisors, whose sum is σ = 1256940. Its totient is φ = 1256938.

The previous prime is 1256923. The next prime is 1256953. The reversal of 1256939 is 9396521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1256939 - 2⁴ = 1256923 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1256899 and 1256908.

It is not a weakly prime, because it can be changed into another prime (1256989) 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 as a sum of consecutive naturals, namely, 628469 + 628470.

It is an arithmetic number, because the mean of its divisors is an integer number (628470).

2^1256939 is an apocalyptic number.

1256939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256939 is an equidigital number, since it uses as much as digits as its factorization.

1256939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 35.

The square root of 1256939 is about 1121.1329091593. The cubic root of 1256939 is about 107.9206950953.

The spelling of 1256939 in words is "one million, two hundred fifty-six thousand, nine hundred thirty-nine".