9816840 has 192 divisors, whose sum is σ = 36279360. Its totient is φ = 2280960.

The previous prime is 9816839. The next prime is 9816841. The reversal of 9816840 is 486189.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9816839) and next prime (9816841).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 9816795 and 9816804.

It is not an unprimeable number, because it can be changed into a prime (9816841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 146487 + ... + 146553.

It is an arithmetic number, because the mean of its divisors is an integer number (188955).

Almost surely, 2^9816840 is an apocalyptic number.

9816840 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 9816840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18139680).

9816840 is an abundant number, since it is smaller than the sum of its proper divisors (26462520).

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

9816840 is a wasteful number, since it uses less digits than its factorization.

9816840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 9816840 is about 3133.1836843696. The cubic root of 9816840 is about 214.1200014066.

The spelling of 9816840 in words is "nine million, eight hundred sixteen thousand, eight hundred forty".