449773721 has 4 divisors (see below), whose sum is σ = 451640244. Its totient is φ = 447907200.

The previous prime is 449773661. The next prime is 449773769. The reversal of 449773721 is 127377944.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 262083721 + 187690000 = 16189^2 + 13700^2 .

It is a cyclic number.

It is not a de Polignac number, because 449773721 - 2²⁶ = 382664857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (449773021) 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 in 3 ways as a sum of consecutive naturals, for example, 932900 + ... + 933381.

It is an arithmetic number, because the mean of its divisors is an integer number (112910061).

Almost surely, 2^449773721 is an apocalyptic number.

It is an amenable number.

449773721 is a deficient number, since it is larger than the sum of its proper divisors (1866523).

449773721 is a wasteful number, since it uses less digits than its factorization.

449773721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866522.

The product of its digits is 296352, while the sum is 44.

The square root of 449773721 is about 21207.8693177792. The cubic root of 449773721 is about 766.1809666125.

The spelling of 449773721 in words is "four hundred forty-nine million, seven hundred seventy-three thousand, seven hundred twenty-one".