999991230 has 256 divisors, whose sum is σ = 2993227776. Its totient is φ = 209018880.

The previous prime is 999991229. The next prime is 999991231. The reversal of 999991230 is 32199999.

It is an interprime number because it is at equal distance from previous prime (999991229) and next prime (999991231).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999991231) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13698474 + ... + 13698546.

It is an arithmetic number, because the mean of its divisors is an integer number (11692296).

Almost surely, 2^999991230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999991230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1496613888).

999991230 is an abundant number, since it is smaller than the sum of its proper divisors (1993236546).

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

999991230 is a wasteful number, since it uses less digits than its factorization.

999991230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211.

The product of its (nonzero) digits is 354294, while the sum is 51.

The square root of 999991230 is about 31622.6379355044. The cubic root of 999991230 is about 999.9970766581.

The spelling of 999991230 in words is "nine hundred ninety-nine million, nine hundred ninety-one thousand, two hundred thirty".