440763221 has 2 divisors, whose sum is σ = 440763222. Its totient is φ = 440763220.

The previous prime is 440763209. The next prime is 440763223. The reversal of 440763221 is 122367044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338044996 + 102718225 = 18386^2 + 10135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440763221 is a prime.

Together with 440763223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440763223) 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, 220381610 + 220381611.

It is an arithmetic number, because the mean of its divisors is an integer number (220381611).

Almost surely, 2^440763221 is an apocalyptic number.

It is an amenable number.

440763221 is a deficient number, since it is larger than the sum of its proper divisors (1).

440763221 is an equidigital number, since it uses as much as digits as its factorization.

440763221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 440763221 is about 20994.3616478330. The cubic root of 440763221 is about 761.0300098160.

The spelling of 440763221 in words is "four hundred forty million, seven hundred sixty-three thousand, two hundred twenty-one".