497821 has 4 divisors (see below), whose sum is σ = 506044. Its totient is φ = 489600.

The previous prime is 497813. The next prime is 497831. The reversal of 497821 is 128794.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 416025 = 286^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 497821 - 2³ = 497813 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (497801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4020 + ... + 4141.

It is an arithmetic number, because the mean of its divisors is an integer number (126511).

2⁴⁹⁷⁸²¹ is an apocalyptic number.

It is an amenable number.

497821 is a deficient number, since it is larger than the sum of its proper divisors (8223).

497821 is an equidigital number, since it uses as much as digits as its factorization.

497821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8222.

The product of its digits is 4032, while the sum is 31.

The square root of 497821 is about 705.5643131565. The cubic root of 497821 is about 79.2545864721.

The spelling of 497821 in words is "four hundred ninety-seven thousand, eight hundred twenty-one".