9921023 has 16 divisors (see below), whose sum is σ = 11827200. Its totient is φ = 8143200.

The previous prime is 9921019. The next prime is 9921053. The reversal of 9921023 is 3201299.

It is a cyclic number.

It is not a de Polignac number, because 9921023 - 2² = 9921019 is a prime.

9921023 is a modest number, since divided by 1023 gives 992 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 9920983 and 9921001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28253 + ... + 28601.

It is an arithmetic number, because the mean of its divisors is an integer number (739200).

Almost surely, 2^9921023 is an apocalyptic number.

9921023 is a deficient number, since it is larger than the sum of its proper divisors (1906177).

9921023 is a wasteful number, since it uses less digits than its factorization.

9921023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 9921023 is about 3149.7655468304. The cubic root of 9921023 is about 214.8748000113.

The spelling of 9921023 in words is "nine million, nine hundred twenty-one thousand, twenty-three".