99797839 has 4 divisors (see below), whose sum is σ = 100036440. Its totient is φ = 99559240.

The previous prime is 99797827. The next prime is 99797849. The reversal of 99797839 is 93879799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93879799 = 13 ⋅7221523.

It is a cyclic number.

It is not a de Polignac number, because 99797839 - 2⁵ = 99797807 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 (99797849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118672 + ... + 119509.

It is an arithmetic number, because the mean of its divisors is an integer number (25009110).

Almost surely, 2^99797839 is an apocalyptic number.

99797839 is a deficient number, since it is larger than the sum of its proper divisors (238601).

99797839 is a wasteful number, since it uses less digits than its factorization.

99797839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238600.

The product of its digits is 7715736, while the sum is 61.

The square root of 99797839 is about 9989.8868361959. The cubic root of 99797839 is about 463.8458896026.

The spelling of 99797839 in words is "ninety-nine million, seven hundred ninety-seven thousand, eight hundred thirty-nine".