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3220321 = 13247717
BaseRepresentation
bin1100010010001101100001
320001121110011
430102031201
51311022241
6153004521
736241456
oct14221541
96047404
103220321
1118aa525
1210b3741
13889a20
145db82d
15439281
hex312361

3220321 has 4 divisors (see below), whose sum is σ = 3468052. Its totient is φ = 2972592.

The previous prime is 3220319. The next prime is 3220351. The reversal of 3220321 is 1230223.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 192721 + 3027600 = 439^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220321 - 21 = 3220319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 247717 = 3220321 / (3 + 2 + 2 + 0 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3220351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123846 + ... + 123871.

It is an arithmetic number, because the mean of its divisors is an integer number (867013).

Almost surely, 23220321 is an apocalyptic number.

It is an amenable number.

3220321 is a deficient number, since it is larger than the sum of its proper divisors (247731).

3220321 is a wasteful number, since it uses less digits than its factorization.

3220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247730.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 3220321 is about 1794.5252854167. The cubic root of 3220321 is about 147.6725319979.

Adding to 3220321 its reverse (1230223), we get a palindrome (4450544).

The spelling of 3220321 in words is "three million, two hundred twenty thousand, three hundred twenty-one".

Divisors: 1 13 247717 3220321