9905438 has 16 divisors (see below), whose sum is σ = 15289344. Its totient is φ = 4810680.

The previous prime is 9905431. The next prime is 9905447. The reversal of 9905438 is 8345099.

9905438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9905431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15383 + ... + 16013.

It is an arithmetic number, because the mean of its divisors is an integer number (955584).

Almost surely, 2^9905438 is an apocalyptic number.

9905438 is a deficient number, since it is larger than the sum of its proper divisors (5383906).

9905438 is a wasteful number, since it uses less digits than its factorization.

9905438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 9905438 is about 3147.2905808012. The cubic root of 9905438 is about 214.7622249656.

The spelling of 9905438 in words is "nine million, nine hundred five thousand, four hundred thirty-eight".