457721 has 4 divisors (see below), whose sum is σ = 499344. Its totient is φ = 416100.

The previous prime is 457711. The next prime is 457739. The reversal of 457721 is 127754.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 457721 - 2¹⁰ = 456697 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 457721.

It is not an unprimeable number, because it can be changed into a prime (457711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20795 + ... + 20816.

It is an arithmetic number, because the mean of its divisors is an integer number (124836).

2⁴⁵⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

457721 is a deficient number, since it is larger than the sum of its proper divisors (41623).

457721 is a wasteful number, since it uses less digits than its factorization.

457721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41622.

The product of its digits is 1960, while the sum is 26.

The square root of 457721 is about 676.5508110999. The cubic root of 457721 is about 77.0667325017.

The spelling of 457721 in words is "four hundred fifty-seven thousand, seven hundred twenty-one".