1200889 has 2 divisors, whose sum is σ = 1200890. Its totient is φ = 1200888.

The previous prime is 1200887. The next prime is 1200917. The reversal of 1200889 is 9880021.

It is an a-pointer prime, because the next prime (1200917) can be obtained adding 1200889 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 840889 + 360000 = 917^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200889 - 2¹ = 1200887 is a prime.

Together with 1200887, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1200883) 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, 600444 + 600445.

It is an arithmetic number, because the mean of its divisors is an integer number (600445).

2^1200889 is an apocalyptic number.

It is an amenable number.

1200889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200889 is an equidigital number, since it uses as much as digits as its factorization.

1200889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1200889 is about 1095.8508110140. The cubic root of 1200889 is about 106.2920922037.

The spelling of 1200889 in words is "one million, two hundred thousand, eight hundred eighty-nine".