199689139 has 4 divisors (see below), whose sum is σ = 215049856. Its totient is φ = 184328424.

The previous prime is 199689121. The next prime is 199689143. The reversal of 199689139 is 931986991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931986991 = 13 ⋅71691307.

It is a cyclic number.

It is not a de Polignac number, because 199689139 - 2¹¹ = 199687091 is a prime.

It is a super-2 number, since 2×199689139² = 79751504469122642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199689139.

It is not an unprimeable number, because it can be changed into a prime (199689179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7680339 + ... + 7680364.

It is an arithmetic number, because the mean of its divisors is an integer number (53762464).

Almost surely, 2^199689139 is an apocalyptic number.

199689139 is a deficient number, since it is larger than the sum of its proper divisors (15360717).

199689139 is a wasteful number, since it uses less digits than its factorization.

199689139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15360716.

The product of its digits is 944784, while the sum is 55.

The square root of 199689139 is about 14131.1407536688. The cubic root of 199689139 is about 584.5004028357.

The spelling of 199689139 in words is "one hundred ninety-nine million, six hundred eighty-nine thousand, one hundred thirty-nine".