671943 has 8 divisors (see below), whose sum is σ = 909568. Its totient is φ = 441144.

The previous prime is 671941. The next prime is 671947. The reversal of 671943 is 349176.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 671943 - 2¹ = 671941 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471 + ... + 1872.

It is an arithmetic number, because the mean of its divisors is an integer number (113696).

2⁶⁷¹⁹⁴³ is an apocalyptic number.

671943 is a deficient number, since it is larger than the sum of its proper divisors (237625).

671943 is a wasteful number, since it uses less digits than its factorization.

671943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413.

The product of its digits is 4536, while the sum is 30.

The square root of 671943 is about 819.7212940994. The cubic root of 671943 is about 87.5879062139.

The spelling of 671943 in words is "six hundred seventy-one thousand, nine hundred forty-three".