9939918 has 16 divisors (see below), whose sum is σ = 19913040. Its totient is φ = 3307776.

The previous prime is 9939913. The next prime is 9939947. The reversal of 9939918 is 8199399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9939911) 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, 4318 + ... + 6206.

It is an arithmetic number, because the mean of its divisors is an integer number (1244565).

Almost surely, 2^9939918 is an apocalyptic number.

9939918 is an abundant number, since it is smaller than the sum of its proper divisors (9973122).

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

9939918 is a wasteful number, since it uses less digits than its factorization.

9939918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771.

The product of its digits is 157464, while the sum is 48.

The square root of 9939918 is about 3152.7635496497. The cubic root of 9939918 is about 215.0111261594.

The spelling of 9939918 in words is "nine million, nine hundred thirty-nine thousand, nine hundred eighteen".