440505221 has 4 divisors (see below), whose sum is σ = 474390252. Its totient is φ = 406620192.

The previous prime is 440505211. The next prime is 440505281. The reversal of 440505221 is 122505044.

It is a happy number.

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 60684100 + 379821121 = 7790^2 + 19489^2 .

It is a cyclic number.

It is not a de Polignac number, because 440505221 - 2¹⁸ = 440243077 is a prime.

It is a super-3 number, since 3×440505221³ (a number of 27 digits) contains 333 as substring.

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 (440505211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16942496 + ... + 16942521.

It is an arithmetic number, because the mean of its divisors is an integer number (118597563).

Almost surely, 2^440505221 is an apocalyptic number.

It is an amenable number.

440505221 is a deficient number, since it is larger than the sum of its proper divisors (33885031).

440505221 is a wasteful number, since it uses less digits than its factorization.

440505221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33885030.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 440505221 is about 20988.2162415008. The cubic root of 440505221 is about 760.8814916276.

The spelling of 440505221 in words is "four hundred forty million, five hundred five thousand, two hundred twenty-one".