191243838 has 16 divisors (see below), whose sum is σ = 382628880. Its totient is φ = 63724416.

The previous prime is 191243831. The next prime is 191243849. The reversal of 191243838 is 838342191.

191243838 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 191243796 and 191243805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191243831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21606 + ... + 29142.

It is an arithmetic number, because the mean of its divisors is an integer number (23914305).

Almost surely, 2^191243838 is an apocalyptic number.

191243838 is an abundant number, since it is smaller than the sum of its proper divisors (191385042).

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

191243838 is a wasteful number, since it uses less digits than its factorization.

191243838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11771.

The product of its digits is 41472, while the sum is 39.

The square root of 191243838 is about 13829.0938965646. The cubic root of 191243838 is about 576.1414884384.

The spelling of 191243838 in words is "one hundred ninety-one million, two hundred forty-three thousand, eight hundred thirty-eight".