1256429 has 2 divisors, whose sum is σ = 1256430. Its totient is φ = 1256428.

The previous prime is 1256407. The next prime is 1256449. The reversal of 1256429 is 9246521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1214404 + 42025 = 1102^2 + 205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256429 is a prime.

It is a super-2 number, since 2×1256429² = 3157227664082, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256449) 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, 628214 + 628215.

It is an arithmetic number, because the mean of its divisors is an integer number (628215).

2^1256429 is an apocalyptic number.

It is an amenable number.

1256429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256429 is an equidigital number, since it uses as much as digits as its factorization.

1256429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 1256429 is about 1120.9054375816. The cubic root of 1256429 is about 107.9060969326.

The spelling of 1256429 in words is "one million, two hundred fifty-six thousand, four hundred twenty-nine".