199801836 has 96 divisors (see below), whose sum is σ = 563774400. Its totient is φ = 60825600.

The previous prime is 199801831. The next prime is 199801871. The reversal of 199801836 is 638108991.

It is a junction number, because it is equal to n+sod(n) for n = 199801791 and 199801800.

It is not an unprimeable number, because it can be changed into a prime (199801831) 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, 141100 + ... + 142508.

It is an arithmetic number, because the mean of its divisors is an integer number (5872650).

Almost surely, 2^199801836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199801836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281887200).

199801836 is an abundant number, since it is smaller than the sum of its proper divisors (363972564).

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

199801836 is a wasteful number, since it uses less digits than its factorization.

199801836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 199801836 is about 14135.1277320016. The cubic root of 199801836 is about 584.6103387998.

The spelling of 199801836 in words is "one hundred ninety-nine million, eight hundred one thousand, eight hundred thirty-six".