490781 has 4 divisors (see below), whose sum is σ = 492864. Its totient is φ = 488700.

The previous prime is 490771. The next prime is 490783. The reversal of 490781 is 187094.

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 490781 - 2¹⁸ = 228637 is a prime.

It is a super-2 number, since 2×490781² = 481731979922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (123216).

2⁴⁹⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

490781 is a deficient number, since it is larger than the sum of its proper divisors (2083).

490781 is a wasteful number, since it uses less digits than its factorization.

490781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 490781 is about 700.5576350308. The cubic root of 490781 is about 78.8792150922.

The spelling of 490781 in words is "four hundred ninety thousand, seven hundred eighty-one".