990030 has 32 divisors (see below), whose sum is σ = 2419488. Its totient is φ = 259200.

The previous prime is 990023. The next prime is 990037. The reversal of 990030 is 30099.

990030 = 496² + 497² + ... + 499².

It is an interprime number because it is at equal distance from previous prime (990023) and next prime (990037).

It is a junction number, because it is equal to n+sod(n) for n = 989979 and 990006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990037) by changing a digit.

990030 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 15 ways as a sum of consecutive naturals, for example, 1560 + ... + 2100.

It is an arithmetic number, because the mean of its divisors is an integer number (75609).

2⁹⁹⁰⁰³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1209744).

990030 is an abundant number, since it is smaller than the sum of its proper divisors (1429458).

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

990030 is a wasteful number, since it uses less digits than its factorization.

990030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 990030 is about 995.0025125596. The cubic root of 990030 is about 99.6665560538. Note that the first 3 decimals are identical.

The spelling of 990030 in words is "nine hundred ninety thousand, thirty".