491842 has 8 divisors (see below), whose sum is σ = 794556. Its totient is φ = 226992.

The previous prime is 491837. The next prime is 491851. The reversal of 491842 is 248194.

It can be written as a sum of positive squares in 2 ways, for example, as 491401 + 441 = 701^2 + 21^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 491842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9433 + ... + 9484.

2⁴⁹¹⁸⁴² is an apocalyptic number.

491842 is a deficient number, since it is larger than the sum of its proper divisors (302714).

491842 is a wasteful number, since it uses less digits than its factorization.

491842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18932.

The product of its digits is 2304, while the sum is 28.

The square root of 491842 is about 701.3144801015. The cubic root of 491842 is about 78.9360161299.

It can be divided in two parts, 49 and 1842, that added together give a triangular number (1891 = T₆₁).

The spelling of 491842 in words is "four hundred ninety-one thousand, eight hundred forty-two".