490021 has 4 divisors (see below), whose sum is σ = 560032. Its totient is φ = 420012.

The previous prime is 490019. The next prime is 490031. The reversal of 490021 is 120094.

490021 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 490021 - 2¹ = 490019 is a prime.

It is a Duffinian number.

490021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 489977 and 490004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490001) 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, 34995 + ... + 35008.

It is an arithmetic number, because the mean of its divisors is an integer number (140008).

2⁴⁹⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

490021 is a deficient number, since it is larger than the sum of its proper divisors (70011).

490021 is an equidigital number, since it uses as much as digits as its factorization.

490021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70010.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 490021 is about 700.0149998393. The cubic root of 490021 is about 78.8384778628.

The spelling of 490021 in words is "four hundred ninety thousand, twenty-one".