1198779 has 8 divisors (see below), whose sum is σ = 1603920. Its totient is φ = 796416.

The previous prime is 1198751. The next prime is 1198793. The reversal of 1198779 is 9778911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1198779 - 2⁷ = 1198651 is a prime.

It is an Ulam number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1198779.

It is not an unprimeable number, because it can be changed into a prime (1198679) 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 in 7 ways as a sum of consecutive naturals, for example, 739 + ... + 1715.

It is an arithmetic number, because the mean of its divisors is an integer number (200490).

2^1198779 is an apocalyptic number.

1198779 is a deficient number, since it is larger than the sum of its proper divisors (405141).

1198779 is an equidigital number, since it uses as much as digits as its factorization.

1198779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389.

The product of its digits is 31752, while the sum is 42.

The square root of 1198779 is about 1094.8876654708. The cubic root of 1198779 is about 106.2298028507.

It can be divided in two parts, 11 and 98779, that added together give a triangular number (98790 = T₄₄₄).

The spelling of 1198779 in words is "one million, one hundred ninety-eight thousand, seven hundred seventy-nine".