256424743 has 4 divisors (see below), whose sum is σ = 257020128. Its totient is φ = 255829360.

The previous prime is 256424731. The next prime is 256424747. The reversal of 256424743 is 347424652.

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 256424743 - 2¹³ = 256416551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256424747) 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, 297046 + ... + 297907.

It is an arithmetic number, because the mean of its divisors is an integer number (64255032).

Almost surely, 2^256424743 is an apocalyptic number.

256424743 is a deficient number, since it is larger than the sum of its proper divisors (595385).

256424743 is an equidigital number, since it uses as much as digits as its factorization.

256424743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595384.

The product of its digits is 161280, while the sum is 37.

The square root of 256424743 is about 16013.2677177396. The cubic root of 256424743 is about 635.3113921106.

Subtracting 256424743 from its reverse (347424652), we obtain a palindrome (90999909).

The spelling of 256424743 in words is "two hundred fifty-six million, four hundred twenty-four thousand, seven hundred forty-three".