256340279 has 4 divisors (see below), whose sum is σ = 276058776. Its totient is φ = 236621784.

The previous prime is 256340257. The next prime is 256340291. The reversal of 256340279 is 972043652.

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 256340279 - 2¹⁶ = 256274743 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 (256340299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9859229 + ... + 9859254.

It is an arithmetic number, because the mean of its divisors is an integer number (69014694).

Almost surely, 2^256340279 is an apocalyptic number.

256340279 is a deficient number, since it is larger than the sum of its proper divisors (19718497).

256340279 is a wasteful number, since it uses less digits than its factorization.

256340279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19718496.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 256340279 is about 16010.6301874723. The cubic root of 256340279 is about 635.2416291674.

The spelling of 256340279 in words is "two hundred fifty-six million, three hundred forty thousand, two hundred seventy-nine".