4000256 has 40 divisors (see below), whose sum is σ = 8621844. Its totient is φ = 1843200.

The previous prime is 4000237. The next prime is 4000261. The reversal of 4000256 is 6520004.

It can be written as a sum of positive squares in 2 ways, for example, as 4000000 + 256 = 2000^2 + 16^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6356 + ... + 6956.

Almost surely, 2^4000256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4000256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4310922).

4000256 is an abundant number, since it is smaller than the sum of its proper divisors (4621588).

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

4000256 is an equidigital number, since it uses as much as digits as its factorization.

4000256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 4000256 is about 2000.0639989760. The cubic root of 4000256 is about 158.7434915802.

The spelling of 4000256 in words is "four million, two hundred fifty-six", and thus it is an aban number.