256120743 has 8 divisors (see below), whose sum is σ = 341568256. Its totient is φ = 170710200.

The previous prime is 256120723. The next prime is 256120757. The reversal of 256120743 is 347021652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256120743 - 2⁹ = 256120231 is a prime.

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 256120743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256120723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22578 + ... + 31968.

It is an arithmetic number, because the mean of its divisors is an integer number (42696032).

Almost surely, 2^256120743 is an apocalyptic number.

256120743 is a deficient number, since it is larger than the sum of its proper divisors (85447513).

256120743 is an equidigital number, since it uses as much as digits as its factorization.

256120743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18485.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 256120743 is about 16003.7727739430. The cubic root of 256120743 is about 635.0602319538.

Subtracting 256120743 from its reverse (347021652), we obtain a palindrome (90900909).

The spelling of 256120743 in words is "two hundred fifty-six million, one hundred twenty thousand, seven hundred forty-three".