9905823 has 12 divisors (see below), whose sum is σ = 14370928. Its totient is φ = 6575040.

The previous prime is 9905813. The next prime is 9905839. The reversal of 9905823 is 3285099.

It is not a de Polignac number, because 9905823 - 2⁶ = 9905759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9905813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115 + ... + 4452.

Almost surely, 2^9905823 is an apocalyptic number.

9905823 is a deficient number, since it is larger than the sum of its proper divisors (4465105).

9905823 is a wasteful number, since it uses less digits than its factorization.

9905823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4814 (or 4811 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 9905823 is about 3147.3517439269. The cubic root of 9905823 is about 214.7650073559.

The spelling of 9905823 in words is "nine million, nine hundred five thousand, eight hundred twenty-three".