4289221 has 4 divisors (see below), whose sum is σ = 4294444. Its totient is φ = 4284000.

The previous prime is 4289213. The next prime is 4289239. The reversal of 4289221 is 1229824.

It is the 846-th star number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 3101121 = 1090^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 4289221 - 2³ = 4289213 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 4289221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4289251) 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, 1080 + ... + 3121.

It is an arithmetic number, because the mean of its divisors is an integer number (1073611).

Almost surely, 2^4289221 is an apocalyptic number.

It is an amenable number.

4289221 is a deficient number, since it is larger than the sum of its proper divisors (5223).

4289221 is a wasteful number, since it uses less digits than its factorization.

4289221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5222.

The product of its digits is 2304, while the sum is 28.

The square root of 4289221 is about 2071.0434568111. The cubic root of 4289221 is about 162.4773427977.

The spelling of 4289221 in words is "four million, two hundred eighty-nine thousand, two hundred twenty-one".