3220505 has 4 divisors (see below), whose sum is σ = 3864612. Its totient is φ = 2576400.

The previous prime is 3220499. The next prime is 3220513. The reversal of 3220505 is 5050223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5050223 = 59 ⋅85597.

It can be written as a sum of positive squares in 2 ways, for example, as 2408704 + 811801 = 1552^2 + 901^2 .

It is not a de Polignac number, because 3220505 - 2²⁰ = 2171929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322046 + ... + 322055.

It is an arithmetic number, because the mean of its divisors is an integer number (966153).

Almost surely, 2^3220505 is an apocalyptic number.

It is an amenable number.

3220505 is a deficient number, since it is larger than the sum of its proper divisors (644107).

3220505 is an equidigital number, since it uses as much as digits as its factorization.

3220505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644106.

The product of its (nonzero) digits is 300, while the sum is 17.

The square root of 3220505 is about 1794.5765517247. The cubic root of 3220505 is about 147.6753444741.

Adding to 3220505 its reverse (5050223), we get a palindrome (8270728).

The spelling of 3220505 in words is "three million, two hundred twenty thousand, five hundred five".