2256643 has 4 divisors (see below), whose sum is σ = 2279088. Its totient is φ = 2234200.

The previous prime is 2256637. The next prime is 2256673. The reversal of 2256643 is 3466522.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2256643 - 2⁹ = 2256131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256613) 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, 11071 + ... + 11272.

It is an arithmetic number, because the mean of its divisors is an integer number (569772).

2^2256643 is an apocalyptic number.

2256643 is a deficient number, since it is larger than the sum of its proper divisors (22445).

2256643 is a wasteful number, since it uses less digits than its factorization.

2256643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22444.

The product of its digits is 8640, while the sum is 28.

The square root of 2256643 is about 1502.2127013176. The cubic root of 2256643 is about 131.1659028921.

It can be divided in two parts, 22 and 56643, that added together give a palindrome (56665).

The spelling of 2256643 in words is "two million, two hundred fifty-six thousand, six hundred forty-three".