2220665 has 8 divisors (see below), whose sum is σ = 2697408. Its totient is φ = 1754800.

The previous prime is 2220661. The next prime is 2220671. The reversal of 2220665 is 5660222.

It is a happy number.

2220665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2220665 - 2² = 2220661 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 2220665.

It is not an unprimeable number, because it can be changed into a prime (2220661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2261 + ... + 3090.

It is an arithmetic number, because the mean of its divisors is an integer number (337176).

2^2220665 is an apocalyptic number.

It is an amenable number.

2220665 is a deficient number, since it is larger than the sum of its proper divisors (476743).

2220665 is an equidigital number, since it uses as much as digits as its factorization.

2220665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2220665 is about 1490.1895852542. The cubic root of 2220665 is about 130.4650993218.

Adding to 2220665 its reverse (5660222), we get a palindrome (7880887).

It can be divided in two parts, 2 and 220665, that multiplied together give a triangular number (441330 = T₉₃₉).

The spelling of 2220665 in words is "two million, two hundred twenty thousand, six hundred sixty-five".