256434 has 16 divisors (see below), whose sum is σ = 520320. Its totient is φ = 84240.

The previous prime is 256423. The next prime is 256441. The reversal of 256434 is 434652.

It is a d-powerful number, because it can be written as 2⁷ + 5⁷ + 4 + 6 + 3¹¹ + 4⁵ .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256434.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 204 + ... + 744.

It is an arithmetic number, because the mean of its divisors is an integer number (32520).

2²⁵⁶⁴³⁴ is an apocalyptic number.

256434 is an abundant number, since it is smaller than the sum of its proper divisors (263886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256434 is a wasteful number, since it uses less digits than its factorization.

256434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625.

The product of its digits is 2880, while the sum is 24.

The square root of 256434 is about 506.3931279155. The cubic root of 256434 is about 63.5319036988.

The spelling of 256434 in words is "two hundred fifty-six thousand, four hundred thirty-four".