199721607 has 8 divisors (see below), whose sum is σ = 269287920. Its totient is φ = 131651520.

The previous prime is 199721567. The next prime is 199721609. The reversal of 199721607 is 706127991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199721607 - 2¹⁰ = 199720583 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199721609) 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, 373744 + ... + 374277.

It is an arithmetic number, because the mean of its divisors is an integer number (33660990).

Almost surely, 2^199721607 is an apocalyptic number.

199721607 is a deficient number, since it is larger than the sum of its proper divisors (69566313).

199721607 is an equidigital number, since it uses as much as digits as its factorization.

199721607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748113.

The product of its (nonzero) digits is 47628, while the sum is 42.

The square root of 199721607 is about 14132.2895172721. The cubic root of 199721607 is about 584.5320796222.

The spelling of 199721607 in words is "one hundred ninety-nine million, seven hundred twenty-one thousand, six hundred seven".