491838 has 8 divisors (see below), whose sum is σ = 983688. Its totient is φ = 163944.

The previous prime is 491837. The next prime is 491851. The reversal of 491838 is 838194.

It is a sphenic number, since it is the product of 3 distinct primes.

491838 is an admirable number.

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

It is a junction number, because it is equal to n+sod(n) for n = 491799 and 491808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40981 + ... + 40992.

It is an arithmetic number, because the mean of its divisors is an integer number (122961).

2⁴⁹¹⁸³⁸ is an apocalyptic number.

491838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491838 is a wasteful number, since it uses less digits than its factorization.

491838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81978.

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

The square root of 491838 is about 701.3116283080. The cubic root of 491838 is about 78.9358021418.

The spelling of 491838 in words is "four hundred ninety-one thousand, eight hundred thirty-eight".