671826 has 16 divisors (see below), whose sum is σ = 1376928. Its totient is φ = 218400.

The previous prime is 671791. The next prime is 671831. The reversal of 671826 is 628176.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 671793 and 671802.

It is an unprimeable number.

671826 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1120 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (86058).

2⁶⁷¹⁸²⁶ is an apocalyptic number.

671826 is an abundant number, since it is smaller than the sum of its proper divisors (705102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671826 is a wasteful number, since it uses less digits than its factorization.

671826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777.

The product of its digits is 4032, while the sum is 30.

The square root of 671826 is about 819.6499252730. The cubic root of 671826 is about 87.5828222609.

The spelling of 671826 in words is "six hundred seventy-one thousand, eight hundred twenty-six".