9996840 has 96 divisors (see below), whose sum is σ = 37140480. Its totient is φ = 2284416.

The previous prime is 9996829. The next prime is 9996859. The reversal of 9996840 is 486999.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 537 + ... + 4503.

It is an arithmetic number, because the mean of its divisors is an integer number (386880).

Almost surely, 2^9996840 is an apocalyptic number.

9996840 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 9996840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18570240).

9996840 is an abundant number, since it is smaller than the sum of its proper divisors (27143640).

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

9996840 is a wasteful number, since it uses less digits than its factorization.

9996840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991 (or 3984 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 9996840 is about 3161.7779808203. Note that the first 3 decimals coincide. The cubic root of 9996840 is about 215.4207732337.

The spelling of 9996840 in words is "nine million, nine hundred ninety-six thousand, eight hundred forty".