199839139 has 2 divisors, whose sum is σ = 199839140. Its totient is φ = 199839138.

The previous prime is 199839137. The next prime is 199839161. The reversal of 199839139 is 931938991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199839139 - 2¹ = 199839137 is a prime.

It is a super-2 number, since 2×199839139² = 79871362952522642, which contains 22 as substring.

Together with 199839137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199839137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99919569 + 99919570.

It is an arithmetic number, because the mean of its divisors is an integer number (99919570).

Almost surely, 2^199839139 is an apocalyptic number.

199839139 is a deficient number, since it is larger than the sum of its proper divisors (1).

199839139 is an equidigital number, since it uses as much as digits as its factorization.

199839139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 52.

The square root of 199839139 is about 14136.4471844944. The cubic root of 199839139 is about 584.6467187832.

The spelling of 199839139 in words is "one hundred ninety-nine million, eight hundred thirty-nine thousand, one hundred thirty-nine".