500721 has 16 divisors (see below), whose sum is σ = 740544. Its totient is φ = 298944.

The previous prime is 500719. The next prime is 500723. The reversal of 500721 is 127005.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (500719) and next prime (500723).

It is not a de Polignac number, because 500721 - 2¹ = 500719 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 500721.

It is not an unprimeable number, because it can be changed into a prime (500723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1270 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (46284).

2⁵⁰⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

500721 is a deficient number, since it is larger than the sum of its proper divisors (239823).

500721 is a wasteful number, since it uses less digits than its factorization.

500721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400.

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 500721 is about 707.6164215166. The cubic root of 500721 is about 79.4081848140.

Adding to 500721 its reverse (127005), we get a palindrome (627726).

It can be divided in two parts, 500 and 721, that added together give a palindrome (1221).

The spelling of 500721 in words is "five hundred thousand, seven hundred twenty-one".