199943139 has 16 divisors (see below), whose sum is σ = 300856320. Its totient is φ = 116998560.

The previous prime is 199943119. The next prime is 199943141. The reversal of 199943139 is 931349991.

It is not a de Polignac number, because 199943139 - 2²⁴ = 183165923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199943119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103507 + ... + 105420.

It is an arithmetic number, because the mean of its divisors is an integer number (18803520).

Almost surely, 2^199943139 is an apocalyptic number.

199943139 is a deficient number, since it is larger than the sum of its proper divisors (100913181).

199943139 is a wasteful number, since it uses less digits than its factorization.

199943139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208970.

The product of its digits is 236196, while the sum is 48.

The square root of 199943139 is about 14140.1251408890. The cubic root of 199943139 is about 584.7481215321.

The spelling of 199943139 in words is "one hundred ninety-nine million, nine hundred forty-three thousand, one hundred thirty-nine".