9933921 has 20 divisors (see below), whose sum is σ = 15354900. Its totient is φ = 6392736.

The previous prime is 9933887. The next prime is 9933923. The reversal of 9933921 is 1293399.

It can be written as a sum of positive squares in 2 ways, for example, as 8346321 + 1587600 = 2889^2 + 1260^2 .

It is not a de Polignac number, because 9933921 - 2⁷ = 9933793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9933923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 235 + ... + 4463.

It is an arithmetic number, because the mean of its divisors is an integer number (767745).

Almost surely, 2^9933921 is an apocalyptic number.

It is an amenable number.

9933921 is a deficient number, since it is larger than the sum of its proper divisors (5420979).

9933921 is a wasteful number, since it uses less digits than its factorization.

9933921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270 (or 4261 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 9933921 is about 3151.8123357840. The cubic root of 9933921 is about 214.9678769386.

The spelling of 9933921 in words is "nine million, nine hundred thirty-three thousand, nine hundred twenty-one".