1256000423 has 2 divisors, whose sum is σ = 1256000424. Its totient is φ = 1256000422.

The previous prime is 1256000407. The next prime is 1256000467. The reversal of 1256000423 is 3240006521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256000423 - 2⁴ = 1256000407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256000623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628000211 + 628000212.

It is an arithmetic number, because the mean of its divisors is an integer number (628000212).

Almost surely, 2^1256000423 is an apocalyptic number.

1256000423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256000423 is an equidigital number, since it uses as much as digits as its factorization.

1256000423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1256000423 is about 35440.0962611560. The cubic root of 1256000423 is about 1078.9382635447.

Adding to 1256000423 its reverse (3240006521), we get a palindrome (4496006944).

The spelling of 1256000423 in words is "one billion, two hundred fifty-six million, four hundred twenty-three", and thus it is an aban number.