256930 has 8 divisors (see below), whose sum is σ = 462492. Its totient is φ = 102768.

The previous prime is 256903. The next prime is 256931. The reversal of 256930 is 39652.

It can be written as a sum of positive squares in 2 ways, for example, as 251001 + 5929 = 501^2 + 77^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 256895 and 256904.

It is not an unprimeable number, because it can be changed into a prime (256931) by changing a digit.

256930 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12837 + ... + 12856.

2²⁵⁶⁹³⁰ is an apocalyptic number.

256930 is a deficient number, since it is larger than the sum of its proper divisors (205562).

256930 is a wasteful number, since it uses less digits than its factorization.

256930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25700.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 256930 is about 506.8826294124. The cubic root of 256930 is about 63.5728388960.

The spelling of 256930 in words is "two hundred fifty-six thousand, nine hundred thirty".