440204021 has 16 divisors (see below), whose sum is σ = 469497600. Its totient is φ = 412026048.

The previous prime is 440203949. The next prime is 440204071. The reversal of 440204021 is 120402044.

It is a cyclic number.

It is not a de Polignac number, because 440204021 - 2¹⁴ = 440187637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440204071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147086 + ... + 150048.

It is an arithmetic number, because the mean of its divisors is an integer number (29343600).

Almost surely, 2^440204021 is an apocalyptic number.

It is an amenable number.

440204021 is a deficient number, since it is larger than the sum of its proper divisors (29293579).

440204021 is a wasteful number, since it uses less digits than its factorization.

440204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3148.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 440204021 is about 20981.0395595642. The cubic root of 440204021 is about 760.7080318907.

Adding to 440204021 its reverse (120402044), we get a palindrome (560606065).

The spelling of 440204021 in words is "four hundred forty million, two hundred four thousand, twenty-one".