990930 has 64 divisors (see below), whose sum is σ = 2643840. Its totient is φ = 236544.

The previous prime is 990923. The next prime is 990953. The reversal of 990930 is 39099.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is an unprimeable number.

990930 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14757 + ... + 14823.

It is an arithmetic number, because the mean of its divisors is an integer number (41310).

2⁹⁹⁰⁹³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1321920).

990930 is an abundant number, since it is smaller than the sum of its proper divisors (1652910).

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

990930 is a wasteful number, since it uses less digits than its factorization.

990930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 990930 is about 995.4546699875. The cubic root of 990930 is about 99.6967479784.

The spelling of 990930 in words is "nine hundred ninety thousand, nine hundred thirty".