199389137 has 4 divisors (see below), whose sum is σ = 200069940. Its totient is φ = 198708336.

The previous prime is 199389121. The next prime is 199389161. The reversal of 199389137 is 731983991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 731983991 = 313 ⋅2338607.

It can be written as a sum of positive squares in 2 ways, for example, as 143976001 + 55413136 = 11999^2 + 7444^2 .

It is a cyclic number.

It is not a de Polignac number, because 199389137 - 2⁴ = 199389121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199389167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339962 + ... + 340547.

It is an arithmetic number, because the mean of its divisors is an integer number (50017485).

Almost surely, 2^199389137 is an apocalyptic number.

It is an amenable number.

199389137 is a deficient number, since it is larger than the sum of its proper divisors (680803).

199389137 is an equidigital number, since it uses as much as digits as its factorization.

199389137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680802.

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

The square root of 199389137 is about 14120.5218387990. The cubic root of 199389137 is about 584.2075490250.

The spelling of 199389137 in words is "one hundred ninety-nine million, three hundred eighty-nine thousand, one hundred thirty-seven".