491440 has 20 divisors (see below), whose sum is σ = 1142784. Its totient is φ = 196544.

The previous prime is 491429. The next prime is 491461. The reversal of 491440 is 44194.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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, 2992 + ... + 3151.

2⁴⁹¹⁴⁴⁰ is an apocalyptic number.

491440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491440 is an abundant number, since it is smaller than the sum of its proper divisors (651344).

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

491440 is a wasteful number, since it uses less digits than its factorization.

491440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6156 (or 6150 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 491440 is about 701.0278168518. The cubic root of 491440 is about 78.9145045281.

The spelling of 491440 in words is "four hundred ninety-one thousand, four hundred forty".