1198818 has 12 divisors (see below), whose sum is σ = 2597478. Its totient is φ = 399600.

The previous prime is 1198811. The next prime is 1198819. The reversal of 1198818 is 8188911.

It can be written as a sum of positive squares in only one way, i.e., 870489 + 328329 = 933^2 + 573^2 .

It is not an unprimeable number, because it can be changed into a prime (1198811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33283 + ... + 33318.

2^1198818 is an apocalyptic number.

1198818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1198818 is an abundant number, since it is smaller than the sum of its proper divisors (1398660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1198818 is a wasteful number, since it uses less digits than its factorization.

1198818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66609 (or 66606 counting only the distinct ones).

The product of its digits is 4608, while the sum is 36.

The square root of 1198818 is about 1094.9054753722. The cubic root of 1198818 is about 106.2309548332.

It can be divided in two parts, 1198 and 818, that added together give a triangular number (2016 = T₆₃).

The spelling of 1198818 in words is "one million, one hundred ninety-eight thousand, eight hundred eighteen".