199643910 has 64 divisors (see below), whose sum is σ = 505751040. Its totient is φ = 50336000.

The previous prime is 199643881. The next prime is 199643947. The reversal of 199643910 is 19346991.

199643910 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59785 + ... + 63035.

It is an arithmetic number, because the mean of its divisors is an integer number (7902360).

Almost surely, 2^199643910 is an apocalyptic number.

199643910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199643910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252875520).

199643910 is an abundant number, since it is smaller than the sum of its proper divisors (306107130).

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

199643910 is a wasteful number, since it uses less digits than its factorization.

199643910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 199643910 is about 14129.5403322260. The cubic root of 199643910 is about 584.4562702988.

The spelling of 199643910 in words is "one hundred ninety-nine million, six hundred forty-three thousand, nine hundred ten".