3221856 has 120 divisors (see below), whose sum is σ = 10428264. Its totient is φ = 967680.

The previous prime is 3221819. The next prime is 3221899. The reversal of 3221856 is 6581223.

3221856 = 35³ + 36³ + ... + 61³.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28456 + ... + 28568.

Almost surely, 2^3221856 is an apocalyptic number.

3221856 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3221856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5214132).

3221856 is an abundant number, since it is smaller than the sum of its proper divisors (7206408).

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

3221856 is a wasteful number, since it uses less digits than its factorization.

3221856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 129 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 3221856 is about 1794.9529241738. The cubic root of 3221856 is about 147.6959914947.

The spelling of 3221856 in words is "three million, two hundred twenty-one thousand, eight hundred fifty-six".