671838 has 8 divisors (see below), whose sum is σ = 1343688. Its totient is φ = 223944.

The previous prime is 671837. The next prime is 671851. The reversal of 671838 is 838176.

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

671838 is an admirable number.

It is a Curzon number.

It is a nialpdrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 671799 and 671808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671831) 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, 55981 + ... + 55992.

It is an arithmetic number, because the mean of its divisors is an integer number (167961).

2⁶⁷¹⁸³⁸ is an apocalyptic number.

671838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

671838 is a wasteful number, since it uses less digits than its factorization.

671838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111978.

The product of its digits is 8064, while the sum is 33.

The square root of 671838 is about 819.6572454386. The cubic root of 671838 is about 87.5833437192.

The spelling of 671838 in words is "six hundred seventy-one thousand, eight hundred thirty-eight".