506721 has 8 divisors (see below), whose sum is σ = 685984. Its totient is φ = 332640.

The previous prime is 506699. The next prime is 506729. The reversal of 506721 is 127605.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 506721 - 2⁵ = 506689 is a prime.

It is a Duffinian number.

506721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (506729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060 + ... + 1461.

It is an arithmetic number, because the mean of its divisors is an integer number (85748).

2⁵⁰⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

506721 is a deficient number, since it is larger than the sum of its proper divisors (179263).

506721 is a wasteful number, since it uses less digits than its factorization.

506721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 506721 is about 711.8433816508. The cubic root of 506721 is about 79.7241016786.

The spelling of 506721 in words is "five hundred six thousand, seven hundred twenty-one".