1256943 has 4 divisors (see below), whose sum is σ = 1675928. Its totient is φ = 837960.

The previous prime is 1256939. The next prime is 1256953. The reversal of 1256943 is 3496521.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1256943 - 2² = 1256939 is a prime.

It is a D-number.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209488 + ... + 209493.

It is an arithmetic number, because the mean of its divisors is an integer number (418982).

2^1256943 is an apocalyptic number.

1256943 is a deficient number, since it is larger than the sum of its proper divisors (418985).

1256943 is an equidigital number, since it uses as much as digits as its factorization.

1256943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418984.

The product of its digits is 6480, while the sum is 30.

The square root of 1256943 is about 1121.1346930677. The cubic root of 1256943 is about 107.9208095751.

The spelling of 1256943 in words is "one million, two hundred fifty-six thousand, nine hundred forty-three".