671814 has 80 divisors (see below), whose sum is σ = 1829520. Its totient is φ = 181440.

The previous prime is 671791. The next prime is 671831. The reversal of 671814 is 418176.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671814.

It is an unprimeable number.

671814 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 39 ways as a sum of consecutive naturals, for example, 23152 + ... + 23180.

It is an arithmetic number, because the mean of its divisors is an integer number (22869).

2⁶⁷¹⁸¹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914760).

671814 is an abundant number, since it is smaller than the sum of its proper divisors (1157706).

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

671814 is a wasteful number, since it uses less digits than its factorization.

671814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 58 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 671814 is about 819.6426050420. The cubic root of 671814 is about 87.5823007965.

It can be divided in two parts, 671 and 814, that added together give a triangular number (1485 = T₅₄).

The spelling of 671814 in words is "six hundred seventy-one thousand, eight hundred fourteen".