99789839 has 4 divisors (see below), whose sum is σ = 101425800. Its totient is φ = 98153880.

The previous prime is 99789797. The next prime is 99789853. The reversal of 99789839 is 93898799.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 99789839 - 2²⁰ = 98741263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99789139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817889 + ... + 818010.

It is an arithmetic number, because the mean of its divisors is an integer number (25356450).

Almost surely, 2^99789839 is an apocalyptic number.

99789839 is a deficient number, since it is larger than the sum of its proper divisors (1635961).

99789839 is a wasteful number, since it uses less digits than its factorization.

99789839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635960.

The product of its digits is 8817984, while the sum is 62.

The square root of 99789839 is about 9989.4864232352. The cubic root of 99789839 is about 463.8334949913.

The spelling of 99789839 in words is "ninety-nine million, seven hundred eighty-nine thousand, eight hundred thirty-nine".