9856820 has 24 divisors (see below), whose sum is σ = 21789600. Its totient is φ = 3735072.

The previous prime is 9856817. The next prime is 9856829. The reversal of 9856820 is 286589.

9856820 = 225² + 226² + ... + 344².

9856820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9856829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12590 + ... + 13349.

It is an arithmetic number, because the mean of its divisors is an integer number (907900).

Almost surely, 2^9856820 is an apocalyptic number.

It is an amenable number.

9856820 is an abundant number, since it is smaller than the sum of its proper divisors (11932780).

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

9856820 is a wasteful number, since it uses less digits than its factorization.

9856820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25967 (or 25965 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 9856820 is about 3139.5572936323. The cubic root of 9856820 is about 214.4102822814.

The spelling of 9856820 in words is "nine million, eight hundred fifty-six thousand, eight hundred twenty".