1229689 has 2 divisors, whose sum is σ = 1229690. Its totient is φ = 1229688.

The previous prime is 1229663. The next prime is 1229707. The reversal of 1229689 is 9869221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1227664 + 2025 = 1108^2 + 45^2 .

It is an emirp because it is prime and its reverse (9869221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1229689 - 2⁷ = 1229561 is a prime.

It is a Chen prime.

1229689 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1229489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614844 + 614845.

It is an arithmetic number, because the mean of its divisors is an integer number (614845).

2^1229689 is an apocalyptic number.

It is an amenable number.

1229689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229689 is an equidigital number, since it uses as much as digits as its factorization.

1229689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 1229689 is about 1108.9134321488. The cubic root of 1229689 is about 107.1350959034.

The spelling of 1229689 in words is "one million, two hundred twenty-nine thousand, six hundred eighty-nine".