189105839 has 32 divisors (see below), whose sum is σ = 222929280. Its totient is φ = 158957568.

The previous prime is 189105823. The next prime is 189105871. The reversal of 189105839 is 938501981.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 189105839 - 2⁴ = 189105823 is a prime.

It is a super-2 number, since 2×189105839² = 71522036687787842, which contains 22 as substring.

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 189105839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189107839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 979727 + ... + 979919.

It is an arithmetic number, because the mean of its divisors is an integer number (6966540).

Almost surely, 2^189105839 is an apocalyptic number.

189105839 is a deficient number, since it is larger than the sum of its proper divisors (33823441).

189105839 is a wasteful number, since it uses less digits than its factorization.

189105839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 189105839 is about 13751.5758733318. The cubic root of 189105839 is about 573.9864579759.

The spelling of 189105839 in words is "one hundred eighty-nine million, one hundred five thousand, eight hundred thirty-nine".