2220745 has 8 divisors (see below), whose sum is σ = 2673216. Its totient is φ = 1771056.

The previous prime is 2220731. The next prime is 2220749. The reversal of 2220745 is 5470222.

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

It is a cyclic number.

It is not a de Polignac number, because 2220745 - 2¹⁷ = 2089673 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 2074 + ... + 2956.

It is an arithmetic number, because the mean of its divisors is an integer number (334152).

2^2220745 is an apocalyptic number.

It is an amenable number.

2220745 is a deficient number, since it is larger than the sum of its proper divisors (452471).

2220745 is an equidigital number, since it uses as much as digits as its factorization.

2220745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 2220745 is about 1490.2164272346. The cubic root of 2220745 is about 130.4666659820.

Adding to 2220745 its reverse (5470222), we get a palindrome (7690967).

The spelling of 2220745 in words is "two million, two hundred twenty thousand, seven hundred forty-five".