491040 has 144 divisors (see below), whose sum is σ = 1886976. Its totient is φ = 115200.

The previous prime is 491039. The next prime is 491041. The reversal of 491040 is 40194.

It is an interprime number because it is at equal distance from previous prime (491039) and next prime (491041).

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×491040² = 482240563200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (491041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15825 + ... + 15855.

It is an arithmetic number, because the mean of its divisors is an integer number (13104).

2⁴⁹¹⁰⁴⁰ is an apocalyptic number.

491040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943488).

491040 is an abundant number, since it is smaller than the sum of its proper divisors (1395936).

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

491040 is a wasteful number, since it uses less digits than its factorization.

491040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 491040 is about 700.7424633915. The cubic root of 491040 is about 78.8930883024.

It can be divided in two parts, 4910 and 40, that added together give a triangular number (4950 = T₉₉).

The spelling of 491040 in words is "four hundred ninety-one thousand, forty".