199919220 has 96 divisors (see below), whose sum is σ = 587236608. Its totient is φ = 50721792.

The previous prime is 199919219. The next prime is 199919221. The reversal of 199919220 is 22919991.

It is an interprime number because it is at equal distance from previous prime (199919219) and next prime (199919221).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199919221) 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, 437232 + ... + 437688.

It is an arithmetic number, because the mean of its divisors is an integer number (6117048).

Almost surely, 2^199919220 is an apocalyptic number.

199919220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199919220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293618304).

199919220 is an abundant number, since it is smaller than the sum of its proper divisors (387317388).

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

199919220 is a wasteful number, since it uses less digits than its factorization.

199919220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 807 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 199919220 is about 14139.2793309985. The cubic root of 199919220 is about 584.7248029890.

The spelling of 199919220 in words is "one hundred ninety-nine million, nine hundred nineteen thousand, two hundred twenty".