2228689 has 4 divisors (see below), whose sum is σ = 2232756. Its totient is φ = 2224624.

The previous prime is 2228687. The next prime is 2228711. The reversal of 2228689 is 9868222.

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 1404225 + 824464 = 1185^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 2228689 - 2¹ = 2228687 is a prime.

It is a d-powerful number, because it can be written as 2¹³ + 2¹⁴ + 2¹⁹ + 8² + 6⁸ + 8² + 9² .

It is a Duffinian number.

2228689 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2228687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1054 + ... + 2359.

It is an arithmetic number, because the mean of its divisors is an integer number (558189).

2^2228689 is an apocalyptic number.

It is an amenable number.

2228689 is a deficient number, since it is larger than the sum of its proper divisors (4067).

2228689 is an equidigital number, since it uses as much as digits as its factorization.

2228689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066.

The product of its digits is 27648, while the sum is 37.

The square root of 2228689 is about 1492.8794325062. The cubic root of 2228689 is about 130.6220483449.

It can be divided in two parts, 222 and 8689, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 2228689 in words is "two million, two hundred twenty-eight thousand, six hundred eighty-nine".