671859 has 12 divisors (see below), whose sum is σ = 1021800. Its totient is φ = 424224.

The previous prime is 671851. The next prime is 671887. The reversal of 671859 is 958176.

It is not a de Polignac number, because 671859 - 2³ = 671851 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (671851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1794 + ... + 2135.

It is an arithmetic number, because the mean of its divisors is an integer number (85150).

2⁶⁷¹⁸⁵⁹ is an apocalyptic number.

671859 is a deficient number, since it is larger than the sum of its proper divisors (349941).

671859 is a wasteful number, since it uses less digits than its factorization.

671859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954 (or 3951 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 671859 is about 819.6700555711. The cubic root of 671859 is about 87.5842562562.

The spelling of 671859 in words is "six hundred seventy-one thousand, eight hundred fifty-nine".