9939969 has 16 divisors (see below), whose sum is σ = 15859200. Its totient is φ = 6116688.

The previous prime is 9939961. The next prime is 9939971. The reversal of 9939969 is 9699399.

It is not a de Polignac number, because 9939969 - 2³ = 9939961 is a prime.

It is a super-2 number, since 2×9939969² = 197605967441922, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9939961) 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, 13809 + ... + 14510.

It is an arithmetic number, because the mean of its divisors is an integer number (991200).

Almost surely, 2^9939969 is an apocalyptic number.

It is an amenable number.

9939969 is a deficient number, since it is larger than the sum of its proper divisors (5919231).

9939969 is a wasteful number, since it uses less digits than its factorization.

9939969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28341 (or 28335 counting only the distinct ones).

The product of its digits is 1062882, while the sum is 54.

The square root of 9939969 is about 3152.7716377816. The cubic root of 9939969 is about 215.0114938871.

The spelling of 9939969 in words is "nine million, nine hundred thirty-nine thousand, nine hundred sixty-nine".