199942105 has 32 divisors (see below), whose sum is σ = 274959360. Its totient is φ = 138156480.

The previous prime is 199942097. The next prime is 199942139. The reversal of 199942105 is 501249991.

It is not a de Polignac number, because 199942105 - 2³ = 199942097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225994 + ... + 226876.

It is an arithmetic number, because the mean of its divisors is an integer number (8592480).

Almost surely, 2^199942105 is an apocalyptic number.

It is an amenable number.

199942105 is a deficient number, since it is larger than the sum of its proper divisors (75017255).

199942105 is a wasteful number, since it uses less digits than its factorization.

199942105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 199942105 is about 14140.0885782233. The cubic root of 199942105 is about 584.7471135278.

The spelling of 199942105 in words is "one hundred ninety-nine million, nine hundred forty-two thousand, one hundred five".