491790 has 48 divisors (see below), whose sum is σ = 1291248. Its totient is φ = 119808.

The previous prime is 491789. The next prime is 491797. The reversal of 491790 is 97194.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491797) 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, 5022 + ... + 5118.

It is an arithmetic number, because the mean of its divisors is an integer number (26901).

2⁴⁹¹⁷⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645624).

491790 is an abundant number, since it is smaller than the sum of its proper divisors (799458).

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

491790 is a wasteful number, since it uses less digits than its factorization.

491790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 491790 is about 701.2774058816. The cubic root of 491790 is about 78.9332341948.

The spelling of 491790 in words is "four hundred ninety-one thousand, seven hundred ninety".