4138021 has 8 divisors (see below), whose sum is σ = 4475520. Its totient is φ = 3811008.

The previous prime is 4137997. The next prime is 4138033. The reversal of 4138021 is 1208314.

4138021 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 4138021 - 2⁷ = 4137893 is a prime.

It is an Ulam number.

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 4138021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4138051) 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, 1791 + ... + 3388.

It is an arithmetic number, because the mean of its divisors is an integer number (559440).

Almost surely, 2^4138021 is an apocalyptic number.

It is an amenable number.

4138021 is a deficient number, since it is larger than the sum of its proper divisors (337499).

4138021 is a wasteful number, since it uses less digits than its factorization.

4138021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5243.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 4138021 is about 2034.2126240882. The cubic root of 4138021 is about 160.5452879579.

The spelling of 4138021 in words is "four million, one hundred thirty-eight thousand, twenty-one".