199172916 has 72 divisors (see below), whose sum is σ = 538259904. Its totient is φ = 61944960.

The previous prime is 199172879. The next prime is 199172917. The reversal of 199172916 is 619271991.

199172916 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199172917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31015 + ... + 36881.

It is an arithmetic number, because the mean of its divisors is an integer number (7475832).

Almost surely, 2^199172916 is an apocalyptic number.

199172916 is the 7544-th nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199172916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269129952).

199172916 is an abundant number, since it is smaller than the sum of its proper divisors (339086988).

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

199172916 is a wasteful number, since it uses less digits than its factorization.

199172916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5941 (or 5936 counting only the distinct ones).

The product of its digits is 61236, while the sum is 45.

The square root of 199172916 is about 14112.8634939902. The cubic root of 199172916 is about 583.9962977497.

The spelling of 199172916 in words is "one hundred ninety-nine million, one hundred seventy-two thousand, nine hundred sixteen".