199101798 has 108 divisors (see below), whose sum is σ = 533119860. Its totient is φ = 53397792.

The previous prime is 199101797. The next prime is 199101839. The reversal of 199101798 is 897101991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199101797) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1826568 + ... + 1826676.

It is an arithmetic number, because the mean of its divisors is an integer number (4936295).

Almost surely, 2^199101798 is an apocalyptic number.

199101798 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 199101798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266559930).

199101798 is an abundant number, since it is smaller than the sum of its proper divisors (334018062).

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

199101798 is a wasteful number, since it uses less digits than its factorization.

199101798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 45.

The square root of 199101798 is about 14110.3436527960. The cubic root of 199101798 is about 583.9267809469.

The spelling of 199101798 in words is "one hundred ninety-nine million, one hundred one thousand, seven hundred ninety-eight".