99813138 has 8 divisors (see below), whose sum is σ = 199626288. Its totient is φ = 33271044.

The previous prime is 99813127. The next prime is 99813139. The reversal of 99813138 is 83131899.

It is a happy number.

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

99813138 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 99813138.

It is not an unprimeable number, because it can be changed into a prime (99813139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8317756 + ... + 8317767.

It is an arithmetic number, because the mean of its divisors is an integer number (24953286).

Almost surely, 2^99813138 is an apocalyptic number.

99813138 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.

99813138 is a wasteful number, since it uses less digits than its factorization.

99813138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16635528.

The product of its digits is 46656, while the sum is 42.

The square root of 99813138 is about 9990.6525312414. The cubic root of 99813138 is about 463.8695909029.

The spelling of 99813138 in words is "ninety-nine million, eight hundred thirteen thousand, one hundred thirty-eight".