1809198 has 12 divisors (see below), whose sum is σ = 3919968. Its totient is φ = 603060.

The previous prime is 1809193. The next prime is 1809209. The reversal of 1809198 is 8919081.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50238 + ... + 50273.

It is an arithmetic number, because the mean of its divisors is an integer number (326664).

2^1809198 is an apocalyptic number.

1809198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1809198 is an abundant number, since it is smaller than the sum of its proper divisors (2110770).

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

1809198 is a wasteful number, since it uses less digits than its factorization.

1809198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100519 (or 100516 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1809198 is about 1345.0643107302. The cubic root of 1809198 is about 121.8508883267.

The spelling of 1809198 in words is "one million, eight hundred nine thousand, one hundred ninety-eight".