256840367 has 8 divisors (see below), whose sum is σ = 293994912. Its totient is φ = 219801600.

The previous prime is 256840349. The next prime is 256840373. The reversal of 256840367 is 763048652.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256840367 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 (256840387) 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 7 ways as a sum of consecutive naturals, for example, 24134 + ... + 33107.

It is an arithmetic number, because the mean of its divisors is an integer number (36749364).

Almost surely, 2^256840367 is an apocalyptic number.

256840367 is a deficient number, since it is larger than the sum of its proper divisors (37154545).

256840367 is an equidigital number, since it uses as much as digits as its factorization.

256840367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57889.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 256840367 is about 16026.2399520287. The cubic root of 256840367 is about 635.6544532960.

The spelling of 256840367 in words is "two hundred fifty-six million, eight hundred forty thousand, three hundred sixty-seven".