256307849 has 4 divisors (see below), whose sum is σ = 292923264. Its totient is φ = 219692436.

The previous prime is 256307833. The next prime is 256307867. The reversal of 256307849 is 948703652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256307849 - 2⁴ = 256307833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256307809) 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, 18307697 + ... + 18307710.

It is an arithmetic number, because the mean of its divisors is an integer number (73230816).

Almost surely, 2^256307849 is an apocalyptic number.

It is an amenable number.

256307849 is a deficient number, since it is larger than the sum of its proper divisors (36615415).

256307849 is an equidigital number, since it uses as much as digits as its factorization.

256307849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36615414.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 256307849 is about 16009.6173908061. The cubic root of 256307849 is about 635.2148395749.

The spelling of 256307849 in words is "two hundred fifty-six million, three hundred seven thousand, eight hundred forty-nine".