449238721 has 2 divisors, whose sum is σ = 449238722. Its totient is φ = 449238720.

The previous prime is 449238703. The next prime is 449238761. The reversal of 449238721 is 127832944.

It is an a-pointer prime, because the next prime (449238761) can be obtained adding 449238721 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337640625 + 111598096 = 18375^2 + 10564^2 .

It is a cyclic number.

It is not a de Polignac number, because 449238721 - 2⁷ = 449238593 is a prime.

It is not a weakly prime, because it can be changed into another prime (449238761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224619360 + 224619361.

It is an arithmetic number, because the mean of its divisors is an integer number (224619361).

Almost surely, 2^449238721 is an apocalyptic number.

It is an amenable number.

449238721 is a deficient number, since it is larger than the sum of its proper divisors (1).

449238721 is an equidigital number, since it uses as much as digits as its factorization.

449238721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 449238721 is about 21195.2523221593. The cubic root of 449238721 is about 765.8770586459.

The spelling of 449238721 in words is "four hundred forty-nine million, two hundred thirty-eight thousand, seven hundred twenty-one".