491890 has 16 divisors (see below), whose sum is σ = 1012032. Its totient is φ = 168624.

The previous prime is 491873. The next prime is 491899. The reversal of 491890 is 98194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3444 + ... + 3583.

It is an arithmetic number, because the mean of its divisors is an integer number (63252).

2⁴⁹¹⁸⁹⁰ is an apocalyptic number.

491890 is an abundant number, since it is smaller than the sum of its proper divisors (520142).

It is a weird number, because it is abundant, but not a pseudoperfect number.

491890 is a wasteful number, since it uses less digits than its factorization.

491890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 491890 is about 701.3487007188. The cubic root of 491890 is about 78.9385838959.

The spelling of 491890 in words is "four hundred ninety-one thousand, eight hundred ninety".