671918 has 16 divisors (see below), whose sum is σ = 1112496. Its totient is φ = 302400.

The previous prime is 671917. The next prime is 671921. The reversal of 671918 is 819176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671911) 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, 818 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (69531).

2⁶⁷¹⁹¹⁸ is an apocalyptic number.

671918 is a deficient number, since it is larger than the sum of its proper divisors (440578).

671918 is a wasteful number, since it uses less digits than its factorization.

671918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its digits is 3024, while the sum is 32.

The square root of 671918 is about 819.7060448722. The cubic root of 671918 is about 87.5868199488.

The spelling of 671918 in words is "six hundred seventy-one thousand, nine hundred eighteen".