1222989 has 16 divisors (see below), whose sum is σ = 1708224. Its totient is φ = 777600.

The previous prime is 1222967. The next prime is 1222993. The reversal of 1222989 is 9892221.

It is a happy number.

It is not a de Polignac number, because 1222989 - 2⁵ = 1222957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7422 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (106764).

2^1222989 is an apocalyptic number.

It is an amenable number.

1222989 is a deficient number, since it is larger than the sum of its proper divisors (485235).

1222989 is a wasteful number, since it uses less digits than its factorization.

1222989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268.

The product of its digits is 5184, while the sum is 33.

The square root of 1222989 is about 1105.8883307098. Note that the first 3 decimals coincide. The cubic root of 1222989 is about 106.9401651080.

It can be divided in two parts, 1222 and 989, that added together give a triangular number (2211 = T₆₆).

The spelling of 1222989 in words is "one million, two hundred twenty-two thousand, nine hundred eighty-nine".