671823 has 12 divisors (see below), whose sum is σ = 1027728. Its totient is φ = 421440.

The previous prime is 671791. The next prime is 671831. The reversal of 671823 is 328176.

It is not a de Polignac number, because 671823 - 2⁵ = 671791 is a prime.

It is a super-2 number, since 2×671823² = 902692286658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671893) 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, 2043 + ... + 2348.

It is an arithmetic number, because the mean of its divisors is an integer number (85644).

2⁶⁷¹⁸²³ is an apocalyptic number.

671823 is a deficient number, since it is larger than the sum of its proper divisors (355905).

671823 is a wasteful number, since it uses less digits than its factorization.

671823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414 (or 4411 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 671823 is about 819.6480952214. The cubic root of 671823 is about 87.5826918954.

Adding to 671823 its reverse (328176), we get a palindrome (999999).

The spelling of 671823 in words is "six hundred seventy-one thousand, eight hundred twenty-three".