256436 has 6 divisors (see below), whose sum is σ = 448770. Its totient is φ = 128216.

The previous prime is 256423. The next prime is 256441. The reversal of 256436 is 634652.

256436 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 256036 + 400 = 506^2 + 20^2 .

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

It is a congruent number.

It is an unprimeable number.

256436 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 as a sum of consecutive naturals, namely, 32051 + ... + 32058.

It is an arithmetic number, because the mean of its divisors is an integer number (74795).

2²⁵⁶⁴³⁶ is an apocalyptic number.

It is an amenable number.

256436 is a deficient number, since it is larger than the sum of its proper divisors (192334).

256436 is a wasteful number, since it uses less digits than its factorization.

256436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64113 (or 64111 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 256436 is about 506.3951026619. The cubic root of 256436 is about 63.5320688660.

The spelling of 256436 in words is "two hundred fifty-six thousand, four hundred thirty-six".