1189789 has 2 divisors, whose sum is σ = 1189790. Its totient is φ = 1189788.

The previous prime is 1189763. The next prime is 1189801. The reversal of 1189789 is 9879811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1172889 + 16900 = 1083^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189789 - 2⁵ = 1189757 is a prime.

It is an Ulam number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1189709) 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, 594894 + 594895.

It is an arithmetic number, because the mean of its divisors is an integer number (594895).

2^1189789 is an apocalyptic number.

It is an amenable number.

1189789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189789 is an equidigital number, since it uses as much as digits as its factorization.

1189789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 43.

The square root of 1189789 is about 1090.7744954847. The cubic root of 1189789 is about 105.9635866382.

The spelling of 1189789 in words is "one million, one hundred eighty-nine thousand, seven hundred eighty-nine".