671885 has 8 divisors (see below), whose sum is σ = 816480. Its totient is φ = 530704.

The previous prime is 671851. The next prime is 671887. The reversal of 671885 is 588176.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671885 is a prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671887) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 395 + ... + 1224.

It is an arithmetic number, because the mean of its divisors is an integer number (102060).

2⁶⁷¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

671885 is a deficient number, since it is larger than the sum of its proper divisors (144595).

671885 is a wasteful number, since it uses less digits than its factorization.

671885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707.

The product of its digits is 13440, while the sum is 35.

The square root of 671885 is about 819.6859154579. The cubic root of 671885 is about 87.5853860375.

The spelling of 671885 in words is "six hundred seventy-one thousand, eight hundred eighty-five".