40044021 has 4 divisors (see below), whose sum is σ = 53392032. Its totient is φ = 26696012.

The previous prime is 40044019. The next prime is 40044023. The reversal of 40044021 is 12044004.

40044021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40044019) and next prime (40044023).

It is a cyclic number.

It is not a de Polignac number, because 40044021 - 2¹ = 40044019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40044023) 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 3 ways as a sum of consecutive naturals, for example, 6674001 + ... + 6674006.

It is an arithmetic number, because the mean of its divisors is an integer number (13348008).

Almost surely, 2^40044021 is an apocalyptic number.

It is an amenable number.

40044021 is a deficient number, since it is larger than the sum of its proper divisors (13348011).

40044021 is a wasteful number, since it uses less digits than its factorization.

40044021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13348010.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40044021 is about 6328.0345289829. The cubic root of 40044021 is about 342.1206014255.

Adding to 40044021 its reverse (12044004), we get a palindrome (52088025).

The spelling of 40044021 in words is "forty million, forty-four thousand, twenty-one".