491604 has 24 divisors (see below), whose sum is σ = 1165248. Its totient is φ = 161280.

The previous prime is 491593. The next prime is 491611. The reversal of 491604 is 406194.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564 + ... + 1140.

It is an arithmetic number, because the mean of its divisors is an integer number (48552).

2⁴⁹¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

491604 is an abundant number, since it is smaller than the sum of its proper divisors (673644).

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

491604 is a wasteful number, since it uses less digits than its factorization.

491604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 491604 is about 701.1447782020. The cubic root of 491604 is about 78.9232818216.

Adding to 491604 its reverse (406194), we get a palindrome (897798).

It can be divided in two parts, 49 and 1604, that added together give a triangular number (1653 = T₅₇).

The spelling of 491604 in words is "four hundred ninety-one thousand, six hundred four".