9939945 has 16 divisors (see below), whose sum is σ = 16741440. Its totient is φ = 5022144.

The previous prime is 9939913. The next prime is 9939947. The reversal of 9939945 is 5499399.

It is not a de Polignac number, because 9939945 - 2⁵ = 9939913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9939894 and 9939903.

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 15 ways as a sum of consecutive naturals, for example, 17154 + ... + 17723.

It is an arithmetic number, because the mean of its divisors is an integer number (1046340).

Almost surely, 2^9939945 is an apocalyptic number.

9939945 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9939945 is a deficient number, since it is larger than the sum of its proper divisors (6801495).

9939945 is a wasteful number, since it uses less digits than its factorization.

9939945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34904.

The product of its digits is 393660, while the sum is 48.

The square root of 9939945 is about 3152.7678316045. The cubic root of 9939945 is about 215.0113208389.

The spelling of 9939945 in words is "nine million, nine hundred thirty-nine thousand, nine hundred forty-five".