99717839 has 8 divisors (see below), whose sum is σ = 107530752. Its totient is φ = 91925280.

The previous prime is 99717823. The next prime is 99717851. The reversal of 99717839 is 93871799.

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

It is a cyclic number.

It is not a de Polignac number, because 99717839 - 2⁴ = 99717823 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 (99717899) 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, 6002 + ... + 15344.

It is an arithmetic number, because the mean of its divisors is an integer number (13441344).

Almost surely, 2^99717839 is an apocalyptic number.

99717839 is a deficient number, since it is larger than the sum of its proper divisors (7812913).

99717839 is a wasteful number, since it uses less digits than its factorization.

99717839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10177.

The product of its digits is 857304, while the sum is 53.

The square root of 99717839 is about 9985.8819840813. The cubic root of 99717839 is about 463.7219136682.

The spelling of 99717839 in words is "ninety-nine million, seven hundred seventeen thousand, eight hundred thirty-nine".