194109839 has 8 divisors (see below), whose sum is σ = 242007168. Its totient is φ = 151254360.

The previous prime is 194109829. The next prime is 194109841. The reversal of 194109839 is 938901491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194109839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194109839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194109809) 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, 1260377 + ... + 1260530.

It is an arithmetic number, because the mean of its divisors is an integer number (30250896).

Almost surely, 2^194109839 is an apocalyptic number.

194109839 is a deficient number, since it is larger than the sum of its proper divisors (47897329).

194109839 is a wasteful number, since it uses less digits than its factorization.

194109839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2520925.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 194109839 is about 13932.3307095403. The cubic root of 194109839 is about 579.0052697927.

The spelling of 194109839 in words is "one hundred ninety-four million, one hundred nine thousand, eight hundred thirty-nine".