491918 has 16 divisors (see below), whose sum is σ = 864864. Its totient is φ = 205440.

The previous prime is 491899. The next prime is 491923. The reversal of 491918 is 819194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146 + ... + 1002.

It is an arithmetic number, because the mean of its divisors is an integer number (54054).

2⁴⁹¹⁹¹⁸ is an apocalyptic number.

491918 is a deficient number, since it is larger than the sum of its proper divisors (372946).

491918 is a wasteful number, since it uses less digits than its factorization.

491918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907.

The product of its digits is 2592, while the sum is 32.

The square root of 491918 is about 701.3686619746. The cubic root of 491918 is about 78.9400816822.

The spelling of 491918 in words is "four hundred ninety-one thousand, nine hundred eighteen".