440966821 has 2 divisors, whose sum is σ = 440966822. Its totient is φ = 440966820.

The previous prime is 440966809. The next prime is 440966843. The reversal of 440966821 is 128669044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248062500 + 192904321 = 15750^2 + 13889^2 .

It is a cyclic number.

It is not a de Polignac number, because 440966821 - 2⁷ = 440966693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440966881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220483410 + 220483411.

It is an arithmetic number, because the mean of its divisors is an integer number (220483411).

Almost surely, 2^440966821 is an apocalyptic number.

It is an amenable number.

440966821 is a deficient number, since it is larger than the sum of its proper divisors (1).

440966821 is an equidigital number, since it uses as much as digits as its factorization.

440966821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 440966821 is about 20999.2100089503. The cubic root of 440966821 is about 761.1471716321.

The spelling of 440966821 in words is "four hundred forty million, nine hundred sixty-six thousand, eight hundred twenty-one".