1243889 has 2 divisors, whose sum is σ = 1243890. Its totient is φ = 1243888.

The previous prime is 1243883. The next prime is 1243927. The reversal of 1243889 is 9883421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 369664 = 935^2 + 608^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1243883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621944 + 621945.

It is an arithmetic number, because the mean of its divisors is an integer number (621945).

2^1243889 is an apocalyptic number.

It is an amenable number.

1243889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243889 is an equidigital number, since it uses as much as digits as its factorization.

1243889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 1243889 is about 1115.2977181004. The cubic root of 1243889 is about 107.5459043181.

The spelling of 1243889 in words is "one million, two hundred forty-three thousand, eight hundred eighty-nine".