999938 has 4 divisors (see below), whose sum is σ = 1499910.
Its totient is φ = 499968.
The previous prime is 999931. The next prime is 999953. The reversal of 999938 is 839999.
It is a happy number.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 994009 + 5929 = 997^2 + 77^2
It is a junction number, because it is equal to n+sod(n) for n = 999892 and 999901.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999938.
It is not an unprimeable number, because it can be changed into a prime (999931) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249983 + ... + 249986.
2999938 is an apocalyptic number.
999938 is a deficient number, since it is larger than the sum of its proper divisors (499972).
999938 is a wasteful number, since it uses less digits than its factorization.
999938 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 499971.
The product of its digits is 157464, while the sum is 47.
The square root of 999938 is about 999.9689995195.
The cubic root of 999938 is about 99.9979332906.
The spelling of 999938 in words is "nine hundred ninety-nine thousand, nine hundred thirty-eight".