9991230 has 16 divisors (see below), whose sum is σ = 23979024. Its totient is φ = 2664320.

The previous prime is 9991211. The next prime is 9991259. The reversal of 9991230 is 321999.

9991230 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9991191 and 9991200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166491 + ... + 166550.

It is an arithmetic number, because the mean of its divisors is an integer number (1498689).

Almost surely, 2^9991230 is an apocalyptic number.

9991230 is an abundant number, since it is smaller than the sum of its proper divisors (13987794).

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

9991230 is a wasteful number, since it uses less digits than its factorization.

9991230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333051.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 9991230 is about 3160.8906972561. The cubic root of 9991230 is about 215.3804692752.

The spelling of 9991230 in words is "nine million, nine hundred ninety-one thousand, two hundred thirty".