459721 has 4 divisors (see below), whose sum is σ = 461700. Its totient is φ = 457744.

The previous prime is 459703. The next prime is 459749. The reversal of 459721 is 127954.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127954 = 2 ⋅63977.

It can be written as a sum of positive squares in 2 ways, for example, as 55225 + 404496 = 235^2 + 636^2 .

It is a cyclic number.

It is not a de Polignac number, because 459721 - 2⁷ = 459593 is a prime.

It is a super-2 number, since 2×459721² = 422686795682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 459721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (459791) 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, 586 + ... + 1123.

It is an arithmetic number, because the mean of its divisors is an integer number (115425).

2⁴⁵⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

459721 is a deficient number, since it is larger than the sum of its proper divisors (1979).

459721 is a wasteful number, since it uses less digits than its factorization.

459721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978.

The product of its digits is 2520, while the sum is 28.

The square root of 459721 is about 678.0272855866. The cubic root of 459721 is about 77.1788164381.

Adding to 459721 its product of digits (2520), we get a triangular number (462241 = T₉₆₁).

The spelling of 459721 in words is "four hundred fifty-nine thousand, seven hundred twenty-one".