1256443 has 4 divisors (see below), whose sum is σ = 1268080. Its totient is φ = 1244808.

The previous prime is 1256429. The next prime is 1256449. The reversal of 1256443 is 3446521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3446521 = 13 ⋅265117.

It is a cyclic number.

It is not a de Polignac number, because 1256443 - 2⁹ = 1255931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256449) 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, 5655 + ... + 5872.

It is an arithmetic number, because the mean of its divisors is an integer number (317020).

2^1256443 is an apocalyptic number.

1256443 is a deficient number, since it is larger than the sum of its proper divisors (11637).

1256443 is a wasteful number, since it uses less digits than its factorization.

1256443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11636.

The product of its digits is 2880, while the sum is 25.

The square root of 1256443 is about 1120.9116825156. The cubic root of 1256443 is about 107.9064977192.

The spelling of 1256443 in words is "one million, two hundred fifty-six thousand, four hundred forty-three".