587721 has 4 divisors (see below), whose sum is σ = 783632. Its totient is φ = 391812.

The previous prime is 587711. The next prime is 587731. The reversal of 587721 is 127785.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (587711) and next prime (587731).

It is not a de Polignac number, because 587721 - 2¹³ = 579529 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (587711) 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, 97951 + ... + 97956.

It is an arithmetic number, because the mean of its divisors is an integer number (195908).

2⁵⁸⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

587721 is a deficient number, since it is larger than the sum of its proper divisors (195911).

587721 is a wasteful number, since it uses less digits than its factorization.

587721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195910.

The product of its digits is 3920, while the sum is 30.

The square root of 587721 is about 766.6296367869. The cubic root of 587721 is about 83.7639347126.

The spelling of 587721 in words is "five hundred eighty-seven thousand, seven hundred twenty-one".