491644 has 12 divisors (see below), whose sum is σ = 905800. Its totient is φ = 232848.

The previous prime is 491639. The next prime is 491651. The reversal of 491644 is 446194.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3159 + ... + 3310.

2⁴⁹¹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

491644 is a deficient number, since it is larger than the sum of its proper divisors (414156).

491644 is a wasteful number, since it uses less digits than its factorization.

491644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6492 (or 6490 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 491644 is about 701.1733024011. The cubic root of 491644 is about 78.9254223288.

The spelling of 491644 in words is "four hundred ninety-one thousand, six hundred forty-four".