457789721 has 2 divisors, whose sum is σ = 457789722. Its totient is φ = 457789720.

The previous prime is 457789699. The next prime is 457789777. The reversal of 457789721 is 127987754.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424566025 + 33223696 = 20605^2 + 5764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-457789721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 457789721.

It is not a weakly prime, because it can be changed into another prime (457789421) 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 as a sum of consecutive naturals, namely, 228894860 + 228894861.

It is an arithmetic number, because the mean of its divisors is an integer number (228894861).

Almost surely, 2^457789721 is an apocalyptic number.

It is an amenable number.

457789721 is a deficient number, since it is larger than the sum of its proper divisors (1).

457789721 is an equidigital number, since it uses as much as digits as its factorization.

457789721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 50.

The square root of 457789721 is about 21396.0211488024. The cubic root of 457789721 is about 770.7058917267.

The spelling of 457789721 in words is "four hundred fifty-seven million, seven hundred eighty-nine thousand, seven hundred twenty-one".