497721 has 16 divisors (see below), whose sum is σ = 768384. Its totient is φ = 280704.

The previous prime is 497719. The next prime is 497729. The reversal of 497721 is 127794.

It is not a de Polignac number, because 497721 - 2¹ = 497719 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 497721.

It is not an unprimeable number, because it can be changed into a prime (497729) 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, 2791 + ... + 2963.

It is an arithmetic number, because the mean of its divisors is an integer number (48024).

2⁴⁹⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

497721 is a deficient number, since it is larger than the sum of its proper divisors (270663).

497721 is a wasteful number, since it uses less digits than its factorization.

497721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320.

The product of its digits is 3528, while the sum is 30.

The square root of 497721 is about 705.4934443352. The cubic root of 497721 is about 79.2492793507.

The spelling of 497721 in words is "four hundred ninety-seven thousand, seven hundred twenty-one".