1256407 has 2 divisors, whose sum is σ = 1256408. Its totient is φ = 1256406.

The previous prime is 1256393. The next prime is 1256429. The reversal of 1256407 is 7046521.

It is a weak prime.

It is an emirp because it is prime and its reverse (7046521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256407 - 2⁷ = 1256279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256477) 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, 628203 + 628204.

It is an arithmetic number, because the mean of its divisors is an integer number (628204).

2^1256407 is an apocalyptic number.

1256407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256407 is an equidigital number, since it uses as much as digits as its factorization.

1256407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1256407 is about 1120.8956240436. The cubic root of 1256407 is about 107.9054671191.

The spelling of 1256407 in words is "one million, two hundred fifty-six thousand, four hundred seven".