256117743 has 12 divisors (see below), whose sum is σ = 422797648. Its totient is φ = 146352960.

The previous prime is 256117727. The next prime is 256117787. The reversal of 256117743 is 347711652.

It is a happy number.

It is not a de Polignac number, because 256117743 - 2⁴ = 256117727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256117698 and 256117707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256117723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2032618 + ... + 2032743.

Almost surely, 2^256117743 is an apocalyptic number.

256117743 is a deficient number, since it is larger than the sum of its proper divisors (166679905).

256117743 is a wasteful number, since it uses less digits than its factorization.

256117743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065374 (or 4065371 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 256117743 is about 16003.6790457694. The cubic root of 256117743 is about 635.0577524095.

The spelling of 256117743 in words is "two hundred fifty-six million, one hundred seventeen thousand, seven hundred forty-three".