2220709 has 4 divisors (see below), whose sum is σ = 2229004. Its totient is φ = 2212416.

The previous prime is 2220697. The next prime is 2220731. The reversal of 2220709 is 9070222.

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 804609 + 1416100 = 897^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220709 - 2¹⁹ = 1696421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2220709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220749) 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, 3732 + ... + 4285.

It is an arithmetic number, because the mean of its divisors is an integer number (557251).

2^2220709 is an apocalyptic number.

It is an amenable number.

2220709 is a deficient number, since it is larger than the sum of its proper divisors (8295).

2220709 is an equidigital number, since it uses as much as digits as its factorization.

2220709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8294.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 2220709 is about 1490.2043484033. The cubic root of 2220709 is about 130.4659609895.

The spelling of 2220709 in words is "two million, two hundred twenty thousand, seven hundred nine".