1222189 has 6 divisors (see below), whose sum is σ = 1253166. Its totient is φ = 1191960.

The previous prime is 1222187. The next prime is 1222219. The reversal of 1222189 is 9812221.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 66564 = 1075^2 + 258^2 .

It is not a de Polignac number, because 1222189 - 2¹ = 1222187 is a prime.

It is a Duffinian number.

1222189 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1519 + ... + 2179.

It is an arithmetic number, because the mean of its divisors is an integer number (208861).

2^1222189 is an apocalyptic number.

It is an amenable number.

1222189 is a deficient number, since it is larger than the sum of its proper divisors (30977).

1222189 is an frugal number, since it uses more digits than its factorization.

1222189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 704 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 1222189 is about 1105.5265713677. The cubic root of 1222189 is about 106.9168422509.

It can be divided in two parts, 12 and 22189, that added together give a square (22201 = 149²).

The spelling of 1222189 in words is "one million, two hundred twenty-two thousand, one hundred eighty-nine".