99999138 has 8 divisors (see below), whose sum is σ = 199998288. Its totient is φ = 33333044.

The previous prime is 99999131. The next prime is 99999157. The reversal of 99999138 is 83199999.

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

99999138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (99999131) 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, 8333256 + ... + 8333267.

It is an arithmetic number, because the mean of its divisors is an integer number (24999786).

Almost surely, 2^99999138 is an apocalyptic number.

99999138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999138 is a wasteful number, since it uses less digits than its factorization.

99999138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16666528.

The product of its digits is 1417176, while the sum is 57.

The square root of 99999138 is about 9999.9568999071. The cubic root of 99999138 is about 464.1575496743.

The spelling of 99999138 in words is "ninety-nine million, nine hundred ninety-nine thousand, one hundred thirty-eight".