671830 has 24 divisors (see below), whose sum is σ = 1274112. Its totient is φ = 255024.

The previous prime is 671791. The next prime is 671831. The reversal of 671830 is 38176.

It is a junction number, because it is equal to n+sod(n) for n = 671795 and 671804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671831) by changing a digit.

671830 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5227 + ... + 5353.

It is an arithmetic number, because the mean of its divisors is an integer number (53088).

2⁶⁷¹⁸³⁰ is an apocalyptic number.

671830 is a deficient number, since it is larger than the sum of its proper divisors (602282).

671830 is a wasteful number, since it uses less digits than its factorization.

671830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 671830 is about 819.6523653355. The cubic root of 671830 is about 87.5829960810.

The spelling of 671830 in words is "six hundred seventy-one thousand, eight hundred thirty".