4066921 has 8 divisors (see below), whose sum is σ = 4235264. Its totient is φ = 3900960.

The previous prime is 4066901. The next prime is 4066943. The reversal of 4066921 is 1296604.

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 4066921 - 2¹¹ = 4064873 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 4066921.

It is not an unprimeable number, because it can be changed into a prime (4066901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3421 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (529408).

Almost surely, 2^4066921 is an apocalyptic number.

It is an amenable number.

4066921 is a deficient number, since it is larger than the sum of its proper divisors (168343).

4066921 is a wasteful number, since it uses less digits than its factorization.

4066921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 4066921 is about 2016.6608539861. The cubic root of 4066921 is about 159.6204676192.

The spelling of 4066921 in words is "four million, sixty-six thousand, nine hundred twenty-one".