9939906 has 12 divisors (see below), whose sum is σ = 21536502. Its totient is φ = 3313296.

The previous prime is 9939901. The next prime is 9939911. The reversal of 9939906 is 6099399.

It is an interprime number because it is at equal distance from previous prime (9939901) and next prime (9939911).

It can be written as a sum of positive squares in only one way, i.e., 5716881 + 4223025 = 2391^2 + 2055^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9939901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 276091 + ... + 276126.

Almost surely, 2^9939906 is an apocalyptic number.

9939906 is an abundant number, since it is smaller than the sum of its proper divisors (11596596).

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

9939906 is a wasteful number, since it uses less digits than its factorization.

9939906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552225 (or 552222 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 9939906 is about 3152.7616465569. The cubic root of 9939906 is about 215.0110396350.

The spelling of 9939906 in words is "nine million, nine hundred thirty-nine thousand, nine hundred six".