490821 has 12 divisors (see below), whose sum is σ = 679872. Its totient is φ = 314824.

The previous prime is 490783. The next prime is 490829. The reversal of 490821 is 128094.

It is not a de Polignac number, because 490821 - 2⁹ = 490309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 490791 and 490800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8290 + ... + 8348.

It is an arithmetic number, because the mean of its divisors is an integer number (56656).

2⁴⁹⁰⁸²¹ is an apocalyptic number.

It is an amenable number.

490821 is a deficient number, since it is larger than the sum of its proper divisors (189051).

490821 is an equidigital number, since it uses as much as digits as its factorization.

490821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 490821 is about 700.5861831352. The cubic root of 490821 is about 78.8813579915.

The spelling of 490821 in words is "four hundred ninety thousand, eight hundred twenty-one".