199172839 has 8 divisors (see below), whose sum is σ = 209912240. Its totient is φ = 188459136.

The previous prime is 199172807. The next prime is 199172863. The reversal of 199172839 is 938271991.

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

It is a cyclic number.

It is not a de Polignac number, because 199172839 - 2⁵ = 199172807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199172792 and 199172801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199172879) 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, 10687 + ... + 22639.

It is an arithmetic number, because the mean of its divisors is an integer number (26239030).

Almost surely, 2^199172839 is an apocalyptic number.

199172839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

199172839 is a deficient number, since it is larger than the sum of its proper divisors (10739401).

199172839 is a wasteful number, since it uses less digits than its factorization.

199172839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12849.

The product of its digits is 244944, while the sum is 49.

The square root of 199172839 is about 14112.8607659822. The cubic root of 199172839 is about 583.9962224923.

The spelling of 199172839 in words is "one hundred ninety-nine million, one hundred seventy-two thousand, eight hundred thirty-nine".