440642641 has 2 divisors, whose sum is σ = 440642642. Its totient is φ = 440642640.

The previous prime is 440642581. The next prime is 440642651. The reversal of 440642641 is 146246044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 299151616 + 141491025 = 17296^2 + 11895^2 .

It is a cyclic number.

It is not a de Polignac number, because 440642641 - 2⁷ = 440642513 is a prime.

It is not a weakly prime, because it can be changed into another prime (440642651) 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 as a sum of consecutive naturals, namely, 220321320 + 220321321.

It is an arithmetic number, because the mean of its divisors is an integer number (220321321).

Almost surely, 2^440642641 is an apocalyptic number.

It is an amenable number.

440642641 is a deficient number, since it is larger than the sum of its proper divisors (1).

440642641 is an equidigital number, since it uses as much as digits as its factorization.

440642641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 440642641 is about 20991.4897279826. The cubic root of 440642641 is about 760.9606049265.

Adding to 440642641 its reverse (146246044), we get a palindrome (586888685).

The spelling of 440642641 in words is "four hundred forty million, six hundred forty-two thousand, six hundred forty-one".