1800198 has 64 divisors (see below), whose sum is σ = 4432320. Its totient is φ = 539136.

The previous prime is 1800191. The next prime is 1800199. The reversal of 1800198 is 8910081.

It is a Harshad number since it is a multiple of its sum of digits (27).

1800198 is a modest number, since divided by 198 gives 180 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33940 + ... + 33992.

It is an arithmetic number, because the mean of its divisors is an integer number (69255).

2^1800198 is an apocalyptic number.

1800198 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 1800198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2216160).

1800198 is an abundant number, since it is smaller than the sum of its proper divisors (2632122).

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

1800198 is a wasteful number, since it uses less digits than its factorization.

1800198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1800198 is about 1341.7145747140. The cubic root of 1800198 is about 121.6485000294.

The spelling of 1800198 in words is "one million, eight hundred thousand, one hundred ninety-eight".