9825921 has 32 divisors (see below), whose sum is σ = 16992000. Its totient is φ = 5609520.

The previous prime is 9825913. The next prime is 9825929. The reversal of 9825921 is 1295289.

9825921 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9825913) and next prime (9825929).

It is not a de Polignac number, because 9825921 - 2³ = 9825913 is a prime.

9825921 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (9825929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8731 + ... + 9791.

It is an arithmetic number, because the mean of its divisors is an integer number (531000).

Almost surely, 2^9825921 is an apocalyptic number.

It is an amenable number.

9825921 is a deficient number, since it is larger than the sum of its proper divisors (7166079).

9825921 is a wasteful number, since it uses less digits than its factorization.

9825921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1071 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 9825921 is about 3134.6325143468. The cubic root of 9825921 is about 214.1860044681.

It can be divided in two parts, 982 and 5921, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 9825921 in words is "nine million, eight hundred twenty-five thousand, nine hundred twenty-one".