491798 has 4 divisors (see below), whose sum is σ = 737700. Its totient is φ = 245898.

The previous prime is 491797. The next prime is 491819. The reversal of 491798 is 897194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 897194 = 2 ⋅448597.

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 as a sum of consecutive naturals, namely, 122948 + ... + 122951.

It is an arithmetic number, because the mean of its divisors is an integer number (184425).

2⁴⁹¹⁷⁹⁸ is an apocalyptic number.

491798 is a deficient number, since it is larger than the sum of its proper divisors (245902).

491798 is a wasteful number, since it uses less digits than its factorization.

491798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245901.

The product of its digits is 18144, while the sum is 38.

The square root of 491798 is about 701.2831097353. The cubic root of 491798 is about 78.9336621976.

The spelling of 491798 in words is "four hundred ninety-one thousand, seven hundred ninety-eight".