1256347 has 2 divisors, whose sum is σ = 1256348. Its totient is φ = 1256346.

The previous prime is 1256323. The next prime is 1256369. The reversal of 1256347 is 7436521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256347 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

1256347 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1256747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628173 + 628174.

It is an arithmetic number, because the mean of its divisors is an integer number (628174).

2^1256347 is an apocalyptic number.

1256347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256347 is an equidigital number, since it uses as much as digits as its factorization.

1256347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 28.

The square root of 1256347 is about 1120.8688594122. The cubic root of 1256347 is about 107.9037494084.

The spelling of 1256347 in words is "one million, two hundred fifty-six thousand, three hundred forty-seven".