9902820 has 24 divisors (see below), whose sum is σ = 27728064. Its totient is φ = 2640736.

The previous prime is 9902807. The next prime is 9902831. The reversal of 9902820 is 282099.

9902820 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 (30).

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, 82464 + ... + 82583.

It is an arithmetic number, because the mean of its divisors is an integer number (1155336).

Almost surely, 2^9902820 is an apocalyptic number.

It is an amenable number.

9902820 is an abundant number, since it is smaller than the sum of its proper divisors (17825244).

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

9902820 is a wasteful number, since it uses less digits than its factorization.

9902820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165059 (or 165057 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 9902820 is about 3146.8746400198. The cubic root of 9902820 is about 214.7433027989.

The spelling of 9902820 in words is "nine million, nine hundred two thousand, eight hundred twenty".