999630 has 48 divisors (see below), whose sum is σ = 2695680. Its totient is φ = 256704.

The previous prime is 999623. The next prime is 999631. The reversal of 999630 is 36999.

999630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2419 + ... + 2801.

It is an arithmetic number, because the mean of its divisors is an integer number (56160).

2⁹⁹⁹⁶³⁰ is an apocalyptic number.

999630 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 999630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1347840).

999630 is an abundant number, since it is smaller than the sum of its proper divisors (1696050).

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

999630 is a wasteful number, since it uses less digits than its factorization.

999630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 999630 is about 999.8149828843. The cubic root of 999630 is about 99.9876651452.

The spelling of 999630 in words is "nine hundred ninety-nine thousand, six hundred thirty".