440540521 has 8 divisors (see below), whose sum is σ = 446598144. Its totient is φ = 434523600.

The previous prime is 440540501. The next prime is 440540539. The reversal of 440540521 is 125045044.

It is a happy number.

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 440540521 - 2¹⁷ = 440409449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (440540501) 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 7 ways as a sum of consecutive naturals, for example, 11946 + ... + 31996.

It is an arithmetic number, because the mean of its divisors is an integer number (55824768).

Almost surely, 2^440540521 is an apocalyptic number.

It is an amenable number.

440540521 is a deficient number, since it is larger than the sum of its proper divisors (6057623).

440540521 is a wasteful number, since it uses less digits than its factorization.

440540521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20351.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 440540521 is about 20989.0571727269. The cubic root of 440540521 is about 760.9018155632.

Adding to 440540521 its reverse (125045044), we get a palindrome (565585565).

The spelling of 440540521 in words is "four hundred forty million, five hundred forty thousand, five hundred twenty-one".