491388 has 12 divisors (see below), whose sum is σ = 1146600. Its totient is φ = 163792.

The previous prime is 491377. The next prime is 491417. The reversal of 491388 is 883194.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491388.

It is an unprimeable number.

491388 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20463 + ... + 20486.

It is an arithmetic number, because the mean of its divisors is an integer number (95550).

2⁴⁹¹³⁸⁸ is an apocalyptic number.

It is an amenable number.

491388 is an abundant number, since it is smaller than the sum of its proper divisors (655212).

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

491388 is a wasteful number, since it uses less digits than its factorization.

491388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40956 (or 40954 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 491388 is about 700.9907274708. The cubic root of 491388 is about 78.9117210761.

The spelling of 491388 in words is "four hundred ninety-one thousand, three hundred eighty-eight".