1229989 has 4 divisors (see below), whose sum is σ = 1236556. Its totient is φ = 1223424.

The previous prime is 1229981. The next prime is 1229993. The reversal of 1229989 is 9899221.

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 667489 + 562500 = 817^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1229989 - 2³ = 1229981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229981) 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, 2994 + ... + 3379.

It is an arithmetic number, because the mean of its divisors is an integer number (309139).

2^1229989 is an apocalyptic number.

It is an amenable number.

1229989 is a deficient number, since it is larger than the sum of its proper divisors (6567).

1229989 is an equidigital number, since it uses as much as digits as its factorization.

1229989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6566.

The product of its digits is 23328, while the sum is 40.

The square root of 1229989 is about 1109.0486914469. The cubic root of 1229989 is about 107.1438075683.

The spelling of 1229989 in words is "one million, two hundred twenty-nine thousand, nine hundred eighty-nine".