9921240 has 192 divisors, whose sum is σ = 38338560. Its totient is φ = 2177280.

The previous prime is 9921227. The next prime is 9921259. The reversal of 9921240 is 421299.

9921240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78057 + ... + 78183.

It is an arithmetic number, because the mean of its divisors is an integer number (199680).

Almost surely, 2^9921240 is an apocalyptic number.

9921240 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9921240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19169280).

9921240 is an abundant number, since it is smaller than the sum of its proper divisors (28417320).

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

9921240 is a wasteful number, since it uses less digits than its factorization.

9921240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 9921240 is about 3149.7999936504. The cubic root of 9921240 is about 214.8763666337.

The spelling of 9921240 in words is "nine million, nine hundred twenty-one thousand, two hundred forty".