1188839 has 2 divisors, whose sum is σ = 1188840. Its totient is φ = 1188838.

The previous prime is 1188787. The next prime is 1188841. The reversal of 1188839 is 9388811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1188839 - 2¹⁶ = 1123303 is a prime.

Together with 1188841, 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 (1188899) 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, 594419 + 594420.

It is an arithmetic number, because the mean of its divisors is an integer number (594420).

2^1188839 is an apocalyptic number.

1188839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188839 is an equidigital number, since it uses as much as digits as its factorization.

1188839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 38.

The square root of 1188839 is about 1090.3389381289. The cubic root of 1188839 is about 105.9353765350.

The spelling of 1188839 in words is "one million, one hundred eighty-eight thousand, eight hundred thirty-nine".