990050 has 12 divisors (see below), whose sum is σ = 1841586. Its totient is φ = 396000.

The previous prime is 990043. The next prime is 990053. The reversal of 990050 is 50099.

It can be written as a sum of positive squares in 3 ways, for example, as 361201 + 628849 = 601^2 + 793^2 .

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 989998 and 990025.

It is not an unprimeable number, because it can be changed into a prime (990053) by changing a digit.

990050 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9851 + ... + 9950.

2⁹⁹⁰⁰⁵⁰ is an apocalyptic number.

990050 is a deficient number, since it is larger than the sum of its proper divisors (851536).

990050 is a wasteful number, since it uses less digits than its factorization.

990050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19813 (or 19808 counting only the distinct ones).

The product of its (nonzero) digits is 405, while the sum is 23.

The square root of 990050 is about 995.0125627348. The cubic root of 990050 is about 99.6672271842.

The spelling of 990050 in words is "nine hundred ninety thousand, fifty".