440800421 has 4 divisors (see below), whose sum is σ = 441301644. Its totient is φ = 440299200.

The previous prime is 440800391. The next prime is 440800441. The reversal of 440800421 is 124008044.

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 138909796 + 301890625 = 11786^2 + 17375^2 .

It is a cyclic number.

It is not a de Polignac number, because 440800421 - 2¹⁸ = 440538277 is a prime.

It is a super-2 number, since 2×440800421² = 388610022307554482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440800441) 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, 249290 + ... + 251051.

It is an arithmetic number, because the mean of its divisors is an integer number (110325411).

Almost surely, 2^440800421 is an apocalyptic number.

It is an amenable number.

440800421 is a deficient number, since it is larger than the sum of its proper divisors (501223).

440800421 is an equidigital number, since it uses as much as digits as its factorization.

440800421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501222.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 440800421 is about 20995.2475812980. The cubic root of 440800421 is about 761.0514192853.

Adding to 440800421 its reverse (124008044), we get a palindrome (564808465).

The spelling of 440800421 in words is "four hundred forty million, eight hundred thousand, four hundred twenty-one".