9909939 has 16 divisors (see below), whose sum is σ = 14373632. Its totient is φ = 6036768.

The previous prime is 9909917. The next prime is 9909943. The reversal of 9909939 is 9399099.

It is not a de Polignac number, because 9909939 - 2¹³ = 9901747 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9909989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2784 + ... + 5250.

It is an arithmetic number, because the mean of its divisors is an integer number (898352).

Almost surely, 2^9909939 is an apocalyptic number.

9909939 is a deficient number, since it is larger than the sum of its proper divisors (4463693).

9909939 is a wasteful number, since it uses less digits than its factorization.

9909939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586.

The product of its (nonzero) digits is 177147, while the sum is 48.

The square root of 9909939 is about 3148.0055590802. The cubic root of 9909939 is about 214.7947491339.

The spelling of 9909939 in words is "nine million, nine hundred nine thousand, nine hundred thirty-nine".