199721375 has 64 divisors (see below), whose sum is σ = 303513600. Its totient is φ = 128304000.

The previous prime is 199721371. The next prime is 199721383. The reversal of 199721375 is 573127991.

It is not a de Polignac number, because 199721375 - 2² = 199721371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199721371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1003526 + ... + 1003724.

It is an arithmetic number, because the mean of its divisors is an integer number (4742400).

Almost surely, 2^199721375 is an apocalyptic number.

199721375 is a deficient number, since it is larger than the sum of its proper divisors (103792225).

199721375 is a wasteful number, since it uses less digits than its factorization.

199721375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 279 counting only the distinct ones).

The product of its digits is 119070, while the sum is 44.

The square root of 199721375 is about 14132.2813091164. The cubic root of 199721375 is about 584.5318532880.

The spelling of 199721375 in words is "one hundred ninety-nine million, seven hundred twenty-one thousand, three hundred seventy-five".