199389138 has 32 divisors (see below), whose sum is σ = 430878336. Its totient is φ = 61147008.

The previous prime is 199389121. The next prime is 199389161. The reversal of 199389138 is 831983991.

It is a happy number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 20331 + ... + 28497.

It is an arithmetic number, because the mean of its divisors is an integer number (13464948).

Almost surely, 2^199389138 is an apocalyptic number.

199389138 is an abundant number, since it is smaller than the sum of its proper divisors (231489198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199389138 is a wasteful number, since it uses less digits than its factorization.

199389138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8498.

The product of its digits is 419904, while the sum is 51.

The square root of 199389138 is about 14120.5218742085. The cubic root of 199389138 is about 584.2075500017.

The spelling of 199389138 in words is "one hundred ninety-nine million, three hundred eighty-nine thousand, one hundred thirty-eight".