199724973 has 16 divisors (see below), whose sum is σ = 304644096. Its totient is φ = 114015600.

The previous prime is 199724963. The next prime is 199724999. The reversal of 199724973 is 379427991.

It is not a de Polignac number, because 199724973 - 2⁸ = 199724717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199724933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20040 + ... + 28302.

It is an arithmetic number, because the mean of its divisors is an integer number (19040256).

Almost surely, 2^199724973 is an apocalyptic number.

It is an amenable number.

199724973 is a deficient number, since it is larger than the sum of its proper divisors (104919123).

199724973 is a wasteful number, since it uses less digits than its factorization.

199724973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9424.

The product of its digits is 857304, while the sum is 51.

The square root of 199724973 is about 14132.4086057544. The cubic root of 199724973 is about 584.5353633996.

The spelling of 199724973 in words is "one hundred ninety-nine million, seven hundred twenty-four thousand, nine hundred seventy-three".