9939940 has 12 divisors (see below), whose sum is σ = 20873916. Its totient is φ = 3975968.

The previous prime is 9939913. The next prime is 9939947. The reversal of 9939940 is 499399.

It can be written as a sum of positive squares in 2 ways, for example, as 1401856 + 8538084 = 1184^2 + 2922^2 .

It is not an unprimeable number, because it can be changed into a prime (9939947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248479 + ... + 248518.

It is an arithmetic number, because the mean of its divisors is an integer number (1739493).

Almost surely, 2^9939940 is an apocalyptic number.

It is an amenable number.

9939940 is an abundant number, since it is smaller than the sum of its proper divisors (10933976).

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

9939940 is a wasteful number, since it uses less digits than its factorization.

9939940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497006 (or 497004 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 9939940 is about 3152.7670386503. The cubic root of 9939940 is about 215.0112847872.

The spelling of 9939940 in words is "nine million, nine hundred thirty-nine thousand, nine hundred forty".