990830 has 8 divisors (see below), whose sum is σ = 1783512. Its totient is φ = 396328.

The previous prime is 990809. The next prime is 990841. The reversal of 990830 is 38099.

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

It is a junction number, because it is equal to n+sod(n) for n = 990793 and 990802.

It is a congruent number.

It is an unprimeable number.

990830 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49532 + ... + 49551.

It is an arithmetic number, because the mean of its divisors is an integer number (222939).

2⁹⁹⁰⁸³⁰ is an apocalyptic number.

990830 is a deficient number, since it is larger than the sum of its proper divisors (792682).

990830 is a wasteful number, since it uses less digits than its factorization.

990830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99090.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 990830 is about 995.4044404161. The cubic root of 990830 is about 99.6933942231.

The spelling of 990830 in words is "nine hundred ninety thousand, eight hundred thirty".