671956 has 12 divisors (see below), whose sum is σ = 1214080. Its totient is φ = 325080.

The previous prime is 671947. The next prime is 671969. The reversal of 671956 is 659176.

It is a plaindrome in base 9.

It is a congruent number.

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, 2586 + ... + 2833.

2⁶⁷¹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

671956 is a deficient number, since it is larger than the sum of its proper divisors (542124).

671956 is a wasteful number, since it uses less digits than its factorization.

671956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5454 (or 5452 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 671956 is about 819.7292235854. The cubic root of 671956 is about 87.5884710612.

The spelling of 671956 in words is "six hundred seventy-one thousand, nine hundred fifty-six".