440404421 has 2 divisors, whose sum is σ = 440404422. Its totient is φ = 440404420.

The previous prime is 440404417. The next prime is 440404453. The reversal of 440404421 is 124404044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345439396 + 94965025 = 18586^2 + 9745^2 .

It is a cyclic number.

It is not a de Polignac number, because 440404421 - 2² = 440404417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440400421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220202210 + 220202211.

It is an arithmetic number, because the mean of its divisors is an integer number (220202211).

Almost surely, 2^440404421 is an apocalyptic number.

It is an amenable number.

440404421 is a deficient number, since it is larger than the sum of its proper divisors (1).

440404421 is an equidigital number, since it uses as much as digits as its factorization.

440404421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 440404421 is about 20985.8147566398. The cubic root of 440404421 is about 760.8234501625.

Adding to 440404421 its reverse (124404044), we get a palindrome (564808465).

The spelling of 440404421 in words is "four hundred forty million, four hundred four thousand, four hundred twenty-one".