491730 has 32 divisors (see below), whose sum is σ = 1214784. Its totient is φ = 127296.

The previous prime is 491719. The next prime is 491731. The reversal of 491730 is 37194.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 491730.

It is not an unprimeable number, because it can be changed into a prime (491731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 889 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (37962).

2⁴⁹¹⁷³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (607392).

491730 is an abundant number, since it is smaller than the sum of its proper divisors (723054).

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

491730 is a wasteful number, since it uses less digits than its factorization.

491730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 491730 is about 701.2346254999. The cubic root of 491730 is about 78.9300240260.

It can be divided in two parts, 491 and 730, that added together give a palindrome (1221).

The spelling of 491730 in words is "four hundred ninety-one thousand, seven hundred thirty".