1218798 has 48 divisors (see below), whose sum is σ = 3201120. Its totient is φ = 327168.

The previous prime is 1218787. The next prime is 1218821. The reversal of 1218798 is 8978121.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1858 + ... + 2426.

It is an arithmetic number, because the mean of its divisors is an integer number (66690).

2^1218798 is an apocalyptic number.

1218798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1600560).

1218798 is an abundant number, since it is smaller than the sum of its proper divisors (1982322).

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

1218798 is a wasteful number, since it uses less digits than its factorization.

1218798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 598 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1218798 is about 1103.9918477960. The cubic root of 1218798 is about 106.8178693325.

It can be divided in two parts, 1218 and 798, that added together give a triangular number (2016 = T₆₃).

The spelling of 1218798 in words is "one million, two hundred eighteen thousand, seven hundred ninety-eight".