4165921 has 8 divisors (see below), whose sum is σ = 4576320. Its totient is φ = 3774672.

The previous prime is 4165849. The next prime is 4165927. The reversal of 4165921 is 1295614.

4165921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4165921 - 2¹³ = 4157729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4165921.

It is not an unprimeable number, because it can be changed into a prime (4165927) 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 7 ways as a sum of consecutive naturals, for example, 4330 + ... + 5203.

It is an arithmetic number, because the mean of its divisors is an integer number (572040).

Almost surely, 2^4165921 is an apocalyptic number.

It is an amenable number.

4165921 is a deficient number, since it is larger than the sum of its proper divisors (410399).

4165921 is a wasteful number, since it uses less digits than its factorization.

4165921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9575.

The product of its digits is 2160, while the sum is 28.

The square root of 4165921 is about 2041.0587938617. The cubic root of 4165921 is about 160.9052977516.

The spelling of 4165921 in words is "four million, one hundred sixty-five thousand, nine hundred twenty-one".