1179989 has 2 divisors, whose sum is σ = 1179990. Its totient is φ = 1179988.

The previous prime is 1179979. The next prime is 1179991. The reversal of 1179989 is 9899711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 209764 = 985^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 1179989 - 2⁴ = 1179973 is a prime.

Together with 1179991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1179929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 589994 + 589995.

It is an arithmetic number, because the mean of its divisors is an integer number (589995).

2^1179989 is an apocalyptic number.

It is an amenable number.

1179989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1179989 is an equidigital number, since it uses as much as digits as its factorization.

1179989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 44.

The square root of 1179989 is about 1086.2729859478. The cubic root of 1179989 is about 105.6718521650.

The spelling of 1179989 in words is "one million, one hundred seventy-nine thousand, nine hundred eighty-nine".