491738 has 8 divisors (see below), whose sum is σ = 794388. Its totient is φ = 226944.

The previous prime is 491737. The next prime is 491747. The reversal of 491738 is 837194.

It can be written as a sum of positive squares in 2 ways, for example, as 485809 + 5929 = 697^2 + 77^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 9431 + ... + 9482.

2⁴⁹¹⁷³⁸ is an apocalyptic number.

491738 is a deficient number, since it is larger than the sum of its proper divisors (302650).

491738 is a wasteful number, since it uses less digits than its factorization.

491738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18928.

The product of its digits is 6048, while the sum is 32.

The square root of 491738 is about 701.2403297016. The cubic root of 491738 is about 78.9304520636.

The spelling of 491738 in words is "four hundred ninety-one thousand, seven hundred thirty-eight".