990933 has 4 divisors (see below), whose sum is σ = 1321248. Its totient is φ = 660620.

The previous prime is 990923. The next prime is 990953. The reversal of 990933 is 339099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 990933 - 2⁴ = 990917 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 990894 and 990903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990923) 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, 165153 + ... + 165158.

It is an arithmetic number, because the mean of its divisors is an integer number (330312).

2⁹⁹⁰⁹³³ is an apocalyptic number.

It is an amenable number.

990933 is a deficient number, since it is larger than the sum of its proper divisors (330315).

990933 is a wasteful number, since it uses less digits than its factorization.

990933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330314.

The product of its (nonzero) digits is 6561, while the sum is 33.

The square root of 990933 is about 995.4561768355. The cubic root of 990933 is about 99.6968485875.

The spelling of 990933 in words is "nine hundred ninety thousand, nine hundred thirty-three".