9905023 has 4 divisors (see below), whose sum is σ = 10426360. Its totient is φ = 9383688.

The previous prime is 9905017. The next prime is 9905053. The reversal of 9905023 is 3205099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3205099 = 127 ⋅25237.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9905023 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9904982 and 9905000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9905003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260640 + ... + 260677.

It is an arithmetic number, because the mean of its divisors is an integer number (2606590).

Almost surely, 2^9905023 is an apocalyptic number.

9905023 is a deficient number, since it is larger than the sum of its proper divisors (521337).

9905023 is a wasteful number, since it uses less digits than its factorization.

9905023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521336.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 9905023 is about 3147.2246503864. The cubic root of 9905023 is about 214.7592256848.

The spelling of 9905023 in words is "nine million, nine hundred five thousand, twenty-three".