40444021 has 4 divisors (see below), whose sum is σ = 40459500. Its totient is φ = 40428544.

The previous prime is 40444013. The next prime is 40444031. The reversal of 40444021 is 12044404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30747025 + 9696996 = 5545^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 40444021 - 2³ = 40444013 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 40444021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40444031) 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 3 ways as a sum of consecutive naturals, for example, 2746 + ... + 9403.

It is an arithmetic number, because the mean of its divisors is an integer number (10114875).

Almost surely, 2^40444021 is an apocalyptic number.

It is an amenable number.

40444021 is a deficient number, since it is larger than the sum of its proper divisors (15479).

40444021 is a wasteful number, since it uses less digits than its factorization.

40444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15478.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 40444021 is about 6359.5613842466. The cubic root of 40444021 is about 343.2559776919.

Adding to 40444021 its reverse (12044404), we get a palindrome (52488425).

The spelling of 40444021 in words is "forty million, four hundred forty-four thousand, twenty-one".