9999138 has 8 divisors (see below), whose sum is σ = 19998288. Its totient is φ = 3333044.

The previous prime is 9999083. The next prime is 9999161. The reversal of 9999138 is 8319999.

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

9999138 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833256 + ... + 833267.

It is an arithmetic number, because the mean of its divisors is an integer number (2499786).

Almost surely, 2^9999138 is an apocalyptic number.

9999138 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.

9999138 is a wasteful number, since it uses less digits than its factorization.

9999138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666528.

The product of its digits is 157464, while the sum is 48.

The square root of 9999138 is about 3162.1413630640. The cubic root of 9999138 is about 215.4372784163.

The spelling of 9999138 in words is "nine million, nine hundred ninety-nine thousand, one hundred thirty-eight".