444987821 has 2 divisors, whose sum is σ = 444987822. Its totient is φ = 444987820.

The previous prime is 444987787. The next prime is 444987833. The reversal of 444987821 is 128789444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394022500 + 50965321 = 19850^2 + 7139^2 .

It is a cyclic number.

It is not a de Polignac number, because 444987821 - 2⁶ = 444987757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444987871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222493910 + 222493911.

It is an arithmetic number, because the mean of its divisors is an integer number (222493911).

Almost surely, 2^444987821 is an apocalyptic number.

It is an amenable number.

444987821 is a deficient number, since it is larger than the sum of its proper divisors (1).

444987821 is an equidigital number, since it uses as much as digits as its factorization.

444987821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 47.

The square root of 444987821 is about 21094.7344377691. The cubic root of 444987821 is about 763.4537071512.

The spelling of 444987821 in words is "four hundred forty-four million, nine hundred eighty-seven thousand, eight hundred twenty-one".