199839731 has 8 divisors (see below), whose sum is σ = 245956704. Its totient is φ = 158114880.

The previous prime is 199839719. The next prime is 199839737. The reversal of 199839731 is 137938991.

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 199839731 - 2¹⁰ = 199838707 is a prime.

It is a super-2 number, since 2×199839731² = 79871836172304722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 199839731.

It is not an unprimeable number, because it can be changed into a prime (199839737) 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 7 ways as a sum of consecutive naturals, for example, 1097930 + ... + 1098111.

It is an arithmetic number, because the mean of its divisors is an integer number (30744588).

Almost surely, 2^199839731 is an apocalyptic number.

199839731 is a deficient number, since it is larger than the sum of its proper divisors (46116973).

199839731 is a wasteful number, since it uses less digits than its factorization.

199839731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196061.

The product of its digits is 367416, while the sum is 50.

The square root of 199839731 is about 14136.4681232619. The cubic root of 199839731 is about 584.6472960984.

The spelling of 199839731 in words is "one hundred ninety-nine million, eight hundred thirty-nine thousand, seven hundred thirty-one".