199938139 has 4 divisors (see below), whose sum is σ = 211699224. Its totient is φ = 188177056.

The previous prime is 199938133. The next prime is 199938143. The reversal of 199938139 is 931839991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199938139 - 2⁵ = 199938107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199938133) 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, 5880517 + ... + 5880550.

It is an arithmetic number, because the mean of its divisors is an integer number (52924806).

Almost surely, 2^199938139 is an apocalyptic number.

199938139 is a deficient number, since it is larger than the sum of its proper divisors (11761085).

199938139 is a wasteful number, since it uses less digits than its factorization.

199938139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11761084.

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

The square root of 199938139 is about 14139.9483379537. The cubic root of 199938139 is about 584.7432472046.

The spelling of 199938139 in words is "one hundred ninety-nine million, nine hundred thirty-eight thousand, one hundred thirty-nine".