3221988 has 72 divisors (see below), whose sum is σ = 9473856. Its totient is φ = 834240.

The previous prime is 3221983. The next prime is 3222007. The reversal of 3221988 is 8891223.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10006 + ... + 10322.

Almost surely, 2^3221988 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 3221988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4736928).

3221988 is an abundant number, since it is smaller than the sum of its proper divisors (6251868).

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

3221988 is a wasteful number, since it uses less digits than its factorization.

3221988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 340 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 3221988 is about 1794.9896935637. The cubic root of 3221988 is about 147.6980085106.

The spelling of 3221988 in words is "three million, two hundred twenty-one thousand, nine hundred eighty-eight".