4008021 has 16 divisors (see below), whose sum is σ = 5603328. Its totient is φ = 2545200.

The previous prime is 4008013. The next prime is 4008023. The reversal of 4008021 is 1208004.

4008021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4008021 - 2³ = 4008013 is a prime.

4008021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4008023) 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 15 ways as a sum of consecutive naturals, for example, 6300 + ... + 6906.

It is an arithmetic number, because the mean of its divisors is an integer number (350208).

Almost surely, 2^4008021 is an apocalyptic number.

It is an amenable number.

4008021 is a deficient number, since it is larger than the sum of its proper divisors (1595307).

4008021 is a wasteful number, since it uses less digits than its factorization.

4008021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 4008021 is about 2002.0042457497. The cubic root of 4008021 is about 158.8461388857.

The spelling of 4008021 in words is "four million, eight thousand, twenty-one".