491830 has 16 divisors (see below), whose sum is σ = 894240. Its totient is φ = 194752.

The previous prime is 491819. The next prime is 491833. The reversal of 491830 is 38194.

It is a junction number, because it is equal to n+sod(n) for n = 491795 and 491804.

It is a congruent number.

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

491830 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 7 ways as a sum of consecutive naturals, for example, 1191 + ... + 1549.

It is an arithmetic number, because the mean of its divisors is an integer number (55890).

2⁴⁹¹⁸³⁰ is an apocalyptic number.

491830 is a deficient number, since it is larger than the sum of its proper divisors (402410).

491830 is a wasteful number, since it uses less digits than its factorization.

491830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 491830 is about 701.3059246862. The cubic root of 491830 is about 78.9353741622.

The spelling of 491830 in words is "four hundred ninety-one thousand, eight hundred thirty".