491504 has 40 divisors (see below), whose sum is σ = 1093680. Its totient is φ = 211968.

The previous prime is 491503. The next prime is 491527. The reversal of 491504 is 405194.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 491504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3467 + ... + 3605.

It is an arithmetic number, because the mean of its divisors is an integer number (27342).

2⁴⁹¹⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (546840).

491504 is an abundant number, since it is smaller than the sum of its proper divisors (602176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491504 is a wasteful number, since it uses less digits than its factorization.

491504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 491504 is about 701.0734626271. The cubic root of 491504 is about 78.9179300456.

Adding to 491504 its reverse (405194), we get a palindrome (896698).

The spelling of 491504 in words is "four hundred ninety-one thousand, five hundred four".