9855820 has 24 divisors (see below), whose sum is σ = 22289904. Its totient is φ = 3638976.

The previous prime is 9855817. The next prime is 9855821. The reversal of 9855820 is 285589.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 9855820.

It is not an unprimeable number, because it can be changed into a prime (9855821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18694 + ... + 19213.

It is an arithmetic number, because the mean of its divisors is an integer number (928746).

Almost surely, 2^9855820 is an apocalyptic number.

It is an amenable number.

9855820 is an abundant number, since it is smaller than the sum of its proper divisors (12434084).

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

9855820 is a wasteful number, since it uses less digits than its factorization.

9855820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37929 (or 37927 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 9855820 is about 3139.3980314704. The cubic root of 9855820 is about 214.4030312095.

The spelling of 9855820 in words is "nine million, eight hundred fifty-five thousand, eight hundred twenty".