9945905 has 8 divisors (see below), whose sum is σ = 12189312. Its totient is φ = 7787248.

The previous prime is 9945889. The next prime is 9945919. The reversal of 9945905 is 5095499.

9945905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9945905 - 2⁴ = 9945889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20927 + ... + 21396.

It is an arithmetic number, because the mean of its divisors is an integer number (1523664).

Almost surely, 2^9945905 is an apocalyptic number.

It is an amenable number.

9945905 is a deficient number, since it is larger than the sum of its proper divisors (2243407).

9945905 is a wasteful number, since it uses less digits than its factorization.

9945905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42375.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 9945905 is about 3153.7128911808. The cubic root of 9945905 is about 215.0542859135.

The spelling of 9945905 in words is "nine million, nine hundred forty-five thousand, nine hundred five".