9891630 has 72 divisors (see below), whose sum is σ = 29930472. Its totient is φ = 2259936.

The previous prime is 9891613. The next prime is 9891653. The reversal of 9891630 is 361989.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3289 + ... + 5531.

It is an arithmetic number, because the mean of its divisors is an integer number (415701).

Almost surely, 2^9891630 is an apocalyptic number.

9891630 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 9891630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14965236).

9891630 is an abundant number, since it is smaller than the sum of its proper divisors (20038842).

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

9891630 is a wasteful number, since it uses less digits than its factorization.

9891630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270 (or 2260 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 9891630 is about 3145.0961829489. The cubic root of 9891630 is about 214.6623870182.

The spelling of 9891630 in words is "nine million, eight hundred ninety-one thousand, six hundred thirty".