99639793 has 4 divisors (see below), whose sum is σ = 108697968. Its totient is φ = 90581620.

The previous prime is 99639733. The next prime is 99639803. The reversal of 99639793 is 39793699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39793699 = 11 ⋅3617609.

It is a cyclic number.

It is not a de Polignac number, because 99639793 - 2¹³ = 99631601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99639733) 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, 4529071 + ... + 4529092.

It is an arithmetic number, because the mean of its divisors is an integer number (27174492).

Almost surely, 2^99639793 is an apocalyptic number.

It is an amenable number.

99639793 is a deficient number, since it is larger than the sum of its proper divisors (9058175).

99639793 is a wasteful number, since it uses less digits than its factorization.

99639793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9058174.

The product of its digits is 2480058, while the sum is 55.

The square root of 99639793 is about 9981.9734020884. The cubic root of 99639793 is about 463.6009019316.

The spelling of 99639793 in words is "ninety-nine million, six hundred thirty-nine thousand, seven hundred ninety-three".