3221620 has 24 divisors (see below), whose sum is σ = 6854400. Its totient is φ = 1271712.

The previous prime is 3221599. The next prime is 3221629. The reversal of 3221620 is 261223.

It is a junction number, because it is equal to n+sod(n) for n = 3221594 and 3221603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561 + ... + 2599.

It is an arithmetic number, because the mean of its divisors is an integer number (285600).

Almost surely, 2^3221620 is an apocalyptic number.

It is an amenable number.

3221620 is an abundant number, since it is smaller than the sum of its proper divisors (3632780).

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

3221620 is a wasteful number, since it uses less digits than its factorization.

3221620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 3221620 is about 1794.8871830842. The cubic root of 3221620 is about 147.6923851774.

Adding to 3221620 its reverse (261223), we get a palindrome (3482843).

The spelling of 3221620 in words is "three million, two hundred twenty-one thousand, six hundred twenty".