191838195 has 24 divisors (see below), whose sum is σ = 333075600. Its totient is φ = 102142656.

The previous prime is 191838191. The next prime is 191838197. The reversal of 191838195 is 591838191.

It is not a de Polignac number, because 191838195 - 2² = 191838191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 191838195.

It is not an unprimeable number, because it can be changed into a prime (191838191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26421 + ... + 32889.

It is an arithmetic number, because the mean of its divisors is an integer number (13878150).

Almost surely, 2^191838195 is an apocalyptic number.

191838195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

191838195 is a deficient number, since it is larger than the sum of its proper divisors (141237405).

191838195 is a wasteful number, since it uses less digits than its factorization.

191838195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139 (or 7136 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The square root of 191838195 is about 13850.5665949087. The cubic root of 191838195 is about 576.7377248057.

The spelling of 191838195 in words is "one hundred ninety-one million, eight hundred thirty-eight thousand, one hundred ninety-five".