671865 has 16 divisors (see below), whose sum is σ = 1099008. Its totient is φ = 350336.

The previous prime is 671851. The next prime is 671887. The reversal of 671865 is 568176.

It is a cyclic number.

It is not a de Polignac number, because 671865 - 2⁸ = 671609 is a prime.

671865 is a Rhonda number in base 10.

Its product of digits (10080) is a multiple of the sum of its prime divisors (1008).

It is a plaindrome in base 9.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (68688).

2⁶⁷¹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

671865 is a deficient number, since it is larger than the sum of its proper divisors (427143).

671865 is a wasteful number, since it uses less digits than its factorization.

671865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its digits is 10080, while the sum is 33.

The square root of 671865 is about 819.6737155722. The cubic root of 671865 is about 87.5845169775.

The spelling of 671865 in words is "six hundred seventy-one thousand, eight hundred sixty-five".