9903945 has 16 divisors (see below), whose sum is σ = 16778880. Its totient is φ = 4971264.

The previous prime is 9903937. The next prime is 9903947. The reversal of 9903945 is 5493099.

It is a happy number.

It is not a de Polignac number, because 9903945 - 2³ = 9903937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9903947) 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 15 ways as a sum of consecutive naturals, for example, 19165 + ... + 19674.

It is an arithmetic number, because the mean of its divisors is an integer number (1048680).

Almost surely, 2^9903945 is an apocalyptic number.

It is an amenable number.

9903945 is a deficient number, since it is larger than the sum of its proper divisors (6874935).

9903945 is a wasteful number, since it uses less digits than its factorization.

9903945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38864.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 9903945 is about 3147.0533837226. The cubic root of 9903945 is about 214.7514343906.

The spelling of 9903945 in words is "nine million, nine hundred three thousand, nine hundred forty-five".