1229869 has 2 divisors, whose sum is σ = 1229870. Its totient is φ = 1229868.

The previous prime is 1229827. The next prime is 1229873. The reversal of 1229869 is 9689221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 927369 + 302500 = 963^2 + 550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1229869 is a prime.

It is a super-2 number, since 2×1229869² = 3025155514322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614934 + 614935.

It is an arithmetic number, because the mean of its divisors is an integer number (614935).

2^1229869 is an apocalyptic number.

It is an amenable number.

1229869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229869 is an equidigital number, since it uses as much as digits as its factorization.

1229869 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 1229869 is about 1108.9945897073. The cubic root of 1229869 is about 107.1403230723.

Adding to 1229869 its product of digits (15552), we get a palindrome (1245421).

The spelling of 1229869 in words is "one million, two hundred twenty-nine thousand, eight hundred sixty-nine".