671423 has 4 divisors (see below), whose sum is σ = 673080. Its totient is φ = 669768.

The previous prime is 671417. The next prime is 671431. The reversal of 671423 is 324176.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 671423 - 2¹⁰ = 670399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236 + ... + 1182.

It is an arithmetic number, because the mean of its divisors is an integer number (168270).

2⁶⁷¹⁴²³ is an apocalyptic number.

671423 is a deficient number, since it is larger than the sum of its proper divisors (1657).

671423 is an equidigital number, since it uses as much as digits as its factorization.

671423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656.

The product of its digits is 1008, while the sum is 23.

The square root of 671423 is about 819.4040517352. The cubic root of 671423 is about 87.5653063480.

Adding to 671423 its reverse (324176), we get a palindrome (995599).

The spelling of 671423 in words is "six hundred seventy-one thousand, four hundred twenty-three".