256830189 has 32 divisors (see below), whose sum is σ = 427822080. Its totient is φ = 133142400.

The previous prime is 256830187. The next prime is 256830193. The reversal of 256830189 is 981038652.

It is not a de Polignac number, because 256830189 - 2¹ = 256830187 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256830189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256830181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158817 + ... + 160425.

It is an arithmetic number, because the mean of its divisors is an integer number (13369440).

Almost surely, 2^256830189 is an apocalyptic number.

It is an amenable number.

256830189 is a deficient number, since it is larger than the sum of its proper divisors (170991891).

256830189 is a wasteful number, since it uses less digits than its factorization.

256830189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 256830189 is about 16025.9224071502. The cubic root of 256830189 is about 635.6460566713.

The spelling of 256830189 in words is "two hundred fifty-six million, eight hundred thirty thousand, one hundred eighty-nine".