256394 has 8 divisors (see below), whose sum is σ = 407268. Its totient is φ = 120640.

The previous prime is 256393. The next prime is 256423. The reversal of 256394 is 493652.

It can be written as a sum of positive squares in 2 ways, for example, as 255025 + 1369 = 505^2 + 37^2 .

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

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256394.

It is not an unprimeable number, because it can be changed into a prime (256391) 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, 3737 + ... + 3804.

2²⁵⁶³⁹⁴ is an apocalyptic number.

256394 is a deficient number, since it is larger than the sum of its proper divisors (150874).

256394 is a wasteful number, since it uses less digits than its factorization.

256394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7560.

The product of its digits is 6480, while the sum is 29.

The square root of 256394 is about 506.3536313684. The cubic root of 256394 is about 63.5286001739.

The spelling of 256394 in words is "two hundred fifty-six thousand, three hundred ninety-four".