9891240 has 64 divisors (see below), whose sum is σ = 29937600. Its totient is φ = 2614272.

The previous prime is 9891239. The next prime is 9891241. The reversal of 9891240 is 421989.

It is an interprime number because it is at equal distance from previous prime (9891239) and next prime (9891241).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9891241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16384 + ... + 16976.

It is an arithmetic number, because the mean of its divisors is an integer number (467775).

Almost surely, 2^9891240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9891240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14968800).

9891240 is an abundant number, since it is smaller than the sum of its proper divisors (20046360).

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

9891240 is a wasteful number, since it uses less digits than its factorization.

9891240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 9891240 is about 3145.0341810543. The cubic root of 9891240 is about 214.6595657969.

The spelling of 9891240 in words is "nine million, eight hundred ninety-one thousand, two hundred forty".