9939820 has 24 divisors (see below), whose sum is σ = 22771728. Its totient is φ = 3614400.

The previous prime is 9939817. The next prime is 9939821. The reversal of 9939820 is 289399.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9939821) 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, 22371 + ... + 22810.

It is an arithmetic number, because the mean of its divisors is an integer number (948822).

Almost surely, 2^9939820 is an apocalyptic number.

It is an amenable number.

9939820 is an abundant number, since it is smaller than the sum of its proper divisors (12831908).

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

9939820 is a wasteful number, since it uses less digits than its factorization.

9939820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45201 (or 45199 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 9939820 is about 3152.7480076911. The cubic root of 9939820 is about 215.0104195419.

The spelling of 9939820 in words is "nine million, nine hundred thirty-nine thousand, eight hundred twenty".