490813 has 4 divisors (see below), whose sum is σ = 493920. Its totient is φ = 487708.

The previous prime is 490783. The next prime is 490829. The reversal of 490813 is 318094.

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 490813 - 2¹³ = 482621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1303 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (123480).

2⁴⁹⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

490813 is a deficient number, since it is larger than the sum of its proper divisors (3107).

490813 is a wasteful number, since it uses less digits than its factorization.

490813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 490813 is about 700.5804736074. The cubic root of 490813 is about 78.8809294210.

The spelling of 490813 in words is "four hundred ninety thousand, eight hundred thirteen".