1198999 has 2 divisors, whose sum is σ = 1199000. Its totient is φ = 1198998.

The previous prime is 1198997. The next prime is 1199039. The reversal of 1198999 is 9998911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1198999 - 2¹ = 1198997 is a prime.

Together with 1198997, it forms a pair of twin primes.

It is a Chen prime.

1198999 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1198991) 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, 599499 + 599500.

It is an arithmetic number, because the mean of its divisors is an integer number (599500).

2^1198999 is an apocalyptic number.

1198999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198999 is an equidigital number, since it uses as much as digits as its factorization.

1198999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 46.

The square root of 1198999 is about 1094.9881277895. The cubic root of 1198999 is about 106.2363008866.

It can be divided in two parts, 1198 and 999, that added together give a cube (2197 = 13³).

The spelling of 1198999 in words is "one million, one hundred ninety-eight thousand, nine hundred ninety-nine".