256949 has 16 divisors (see below), whose sum is σ = 331776. Its totient is φ = 193200.

The previous prime is 256939. The next prime is 256957. The reversal of 256949 is 949652.

It is not a de Polignac number, because 256949 - 2¹⁶ = 191413 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256949.

It is not an unprimeable number, because it can be changed into a prime (256939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3584 + ... + 3654.

It is an arithmetic number, because the mean of its divisors is an integer number (20736).

2²⁵⁶⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

256949 is a deficient number, since it is larger than the sum of its proper divisors (74827).

256949 is a wasteful number, since it uses less digits than its factorization.

256949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136.

The product of its digits is 19440, while the sum is 35.

The square root of 256949 is about 506.9013710773. The cubic root of 256949 is about 63.5744059300.

The spelling of 256949 in words is "two hundred fifty-six thousand, nine hundred forty-nine".