4001856 has 56 divisors (see below), whose sum is σ = 11155680. Its totient is φ = 1262592.

The previous prime is 4001849. The next prime is 4001863. The reversal of 4001856 is 6581004.

It is an interprime number because it is at equal distance from previous prime (4001849) and next prime (4001863).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 3100 + ... + 4196.

Almost surely, 2^4001856 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 4001856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5577840).

4001856 is an abundant number, since it is smaller than the sum of its proper divisors (7153824).

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

4001856 is a wasteful number, since it uses less digits than its factorization.

4001856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 4001856 is about 2000.4639461885. The cubic root of 4001856 is about 158.7646532034.

The spelling of 4001856 in words is "four million, one thousand, eight hundred fifty-six".