448040821 has 2 divisors, whose sum is σ = 448040822. Its totient is φ = 448040820.

The previous prime is 448040753. The next prime is 448040839. The reversal of 448040821 is 128040844.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241802500 + 206238321 = 15550^2 + 14361^2 .

It is a cyclic number.

It is not a de Polignac number, because 448040821 - 2⁹ = 448040309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (448050821) 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, 224020410 + 224020411.

It is an arithmetic number, because the mean of its divisors is an integer number (224020411).

Almost surely, 2^448040821 is an apocalyptic number.

It is an amenable number.

448040821 is a deficient number, since it is larger than the sum of its proper divisors (1).

448040821 is an equidigital number, since it uses as much as digits as its factorization.

448040821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 448040821 is about 21166.9747720358. The cubic root of 448040821 is about 765.1957128090.

The spelling of 448040821 in words is "four hundred forty-eight million, forty thousand, eight hundred twenty-one".