199639920 has 80 divisors (see below), whose sum is σ = 620496000. Its totient is φ = 53098752.

The previous prime is 199639903. The next prime is 199639949. The reversal of 199639920 is 29936991.

199639920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 199639920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118927 + ... + 120593.

It is an arithmetic number, because the mean of its divisors is an integer number (7756200).

Almost surely, 2^199639920 is an apocalyptic number.

199639920 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 199639920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310248000).

199639920 is an abundant number, since it is smaller than the sum of its proper divisors (420856080).

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

199639920 is a wasteful number, since it uses less digits than its factorization.

199639920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 48.

The square root of 199639920 is about 14129.3991379676. The cubic root of 199639920 is about 584.4523767064.

The spelling of 199639920 in words is "one hundred ninety-nine million, six hundred thirty-nine thousand, nine hundred twenty".