991230 has 64 divisors (see below), whose sum is σ = 2626560. Its totient is φ = 238464.

The previous prime is 991229. The next prime is 991261. The reversal of 991230 is 32199.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 991230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21067 + ... + 21113.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2⁹⁹¹²³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313280).

991230 is an abundant number, since it is smaller than the sum of its proper divisors (1635330).

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

991230 is a wasteful number, since it uses less digits than its factorization.

991230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 991230 is about 995.6053434971. The cubic root of 991230 is about 99.7068078906.

It can be divided in two parts, 991 and 230, that added together give a palindrome (1221).

The spelling of 991230 in words is "nine hundred ninety-one thousand, two hundred thirty".