256385803 has 4 divisors (see below), whose sum is σ = 258782040. Its totient is φ = 253989568.

The previous prime is 256385749. The next prime is 256385819. The reversal of 256385803 is 308583652.

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 256385803 - 2⁹ = 256385291 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256385873) 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, 1197958 + ... + 1198171.

It is an arithmetic number, because the mean of its divisors is an integer number (64695510).

Almost surely, 2^256385803 is an apocalyptic number.

256385803 is a deficient number, since it is larger than the sum of its proper divisors (2396237).

256385803 is a wasteful number, since it uses less digits than its factorization.

256385803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396236.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 256385803 is about 16012.0518048125. The cubic root of 256385803 is about 635.2792315662.

The spelling of 256385803 in words is "two hundred fifty-six million, three hundred eighty-five thousand, eight hundred three".