1801890198 has 24 divisors (see below), whose sum is σ = 4048692648. Its totient is φ = 600629904.

The previous prime is 1801890179. The next prime is 1801890199. The reversal of 1801890198 is 8910981081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801890199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1853311 + ... + 1854282.

It is an arithmetic number, because the mean of its divisors is an integer number (168695527).

Almost surely, 2^1801890198 is an apocalyptic number.

1801890198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1801890198 is an abundant number, since it is smaller than the sum of its proper divisors (2246802450).

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

1801890198 is an equidigital number, since it uses as much as digits as its factorization.

1801890198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707610 (or 3707598 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 45.

The square root of 1801890198 is about 42448.6772232068. The cubic root of 1801890198 is about 1216.8660488989.

The spelling of 1801890198 in words is "one billion, eight hundred one million, eight hundred ninety thousand, one hundred ninety-eight".