999138 has 16 divisors (see below), whose sum is σ = 2283840. Its totient is φ = 285456.

The previous prime is 999133. The next prime is 999149. The reversal of 999138 is 831999.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 999096 and 999105.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999138.

It is not an unprimeable number, because it can be changed into a prime (999133) 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 7 ways as a sum of consecutive naturals, for example, 11853 + ... + 11936.

It is an arithmetic number, because the mean of its divisors is an integer number (142740).

2⁹⁹⁹¹³⁸ is an apocalyptic number.

999138 is an abundant number, since it is smaller than the sum of its proper divisors (1284702).

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

999138 is a wasteful number, since it uses less digits than its factorization.

999138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23801.

The product of its digits is 17496, while the sum is 39.

The square root of 999138 is about 999.5689070794. The cubic root of 999138 is about 99.9712584067.

The spelling of 999138 in words is "nine hundred ninety-nine thousand, one hundred thirty-eight".