199071820 has 24 divisors (see below), whose sum is σ = 418647600. Its totient is φ = 79515072.

The previous prime is 199071791. The next prime is 199071827. The reversal of 199071820 is 28170991.

It is a super-2 number, since 2×199071820² = 79259179036224800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 199071820.

It is not an unprimeable number, because it can be changed into a prime (199071827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8046 + ... + 21514.

It is an arithmetic number, because the mean of its divisors is an integer number (17443650).

Almost surely, 2^199071820 is an apocalyptic number.

199071820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199071820 is an abundant number, since it is smaller than the sum of its proper divisors (219575780).

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

199071820 is a wasteful number, since it uses less digits than its factorization.

199071820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14217 (or 14215 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 199071820 is about 14109.2813424356. The cubic root of 199071820 is about 583.8974729315.

The spelling of 199071820 in words is "one hundred ninety-nine million, seventy-one thousand, eight hundred twenty".