199544640 has 112 divisors (see below), whose sum is σ = 670876992. Its totient is φ = 50077696.

The previous prime is 199544633. The next prime is 199544641. The reversal of 199544640 is 46445991.

199544640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 199544592 and 199544601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199544641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10207 + ... + 22433.

Almost surely, 2^199544640 is an apocalyptic number.

199544640 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 199544640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335438496).

199544640 is an abundant number, since it is smaller than the sum of its proper divisors (471332352).

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

199544640 is a wasteful number, since it uses less digits than its factorization.

199544640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12264 (or 12254 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 199544640 is about 14126.0270423074. The cubic root of 199544640 is about 584.3593834751.

The spelling of 199544640 in words is "one hundred ninety-nine million, five hundred forty-four thousand, six hundred forty".