9918820 has 24 divisors (see below), whose sum is σ = 22055544. Its totient is φ = 3734016.

The previous prime is 9918787. The next prime is 9918851. The reversal of 9918820 is 288199.

9918820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 481636 + 9437184 = 694^2 + 3072^2 .

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 9918820.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14247 + ... + 14926.

It is an arithmetic number, because the mean of its divisors is an integer number (918981).

Almost surely, 2^9918820 is an apocalyptic number.

It is an amenable number.

9918820 is an abundant number, since it is smaller than the sum of its proper divisors (12136724).

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

9918820 is a wasteful number, since it uses less digits than its factorization.

9918820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29199 (or 29197 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 9918820 is about 3149.4158188464. The cubic root of 9918820 is about 214.8588942515.

The spelling of 9918820 in words is "nine million, nine hundred eighteen thousand, eight hundred twenty".