4023921 has 8 divisors (see below), whose sum is σ = 5853024. Its totient is φ = 2438720.

The previous prime is 4023913. The next prime is 4023937. The reversal of 4023921 is 1293204.

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 4023921 - 2³ = 4023913 is a prime.

It is a Curzon number.

4023921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4023221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60936 + ... + 61001.

It is an arithmetic number, because the mean of its divisors is an integer number (731628).

Almost surely, 2^4023921 is an apocalyptic number.

It is an amenable number.

4023921 is a deficient number, since it is larger than the sum of its proper divisors (1829103).

4023921 is a wasteful number, since it uses less digits than its factorization.

4023921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121951.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 4023921 is about 2005.9713357872. The cubic root of 4023921 is about 159.0559116684.

The spelling of 4023921 in words is "four million, twenty-three thousand, nine hundred twenty-one".