99999939 has 8 divisors (see below), whose sum is σ = 143589712. Its totient is φ = 61538400.

The previous prime is 99999931. The next prime is 99999941. The reversal of 99999939 is 93999999.

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

It is not a de Polignac number, because 99999939 - 2³ = 99999931 is a prime.

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 99999939.

It is not an unprimeable number, because it can be changed into a prime (99999931) 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, 1282012 + ... + 1282089.

It is an arithmetic number, because the mean of its divisors is an integer number (17948714).

Almost surely, 2^99999939 is an apocalyptic number.

99999939 is a deficient number, since it is larger than the sum of its proper divisors (43589773).

99999939 is a wasteful number, since it uses less digits than its factorization.

99999939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564117.

The product of its digits is 14348907, while the sum is 66.

The square root of 99999939 is about 9999.9969499995. The cubic root of 99999939 is about 464.1587889823.

The spelling of 99999939 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred thirty-nine".