671836 has 12 divisors (see below), whose sum is σ = 1282680. Its totient is φ = 305360.

The previous prime is 671831. The next prime is 671837. The reversal of 671836 is 638176.

It is a super-2 number, since 2×671836² = 902727221792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671798 and 671807.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7591 + ... + 7678.

It is an arithmetic number, because the mean of its divisors is an integer number (106890).

2⁶⁷¹⁸³⁶ is an apocalyptic number.

It is an amenable number.

671836 is a deficient number, since it is larger than the sum of its proper divisors (610844).

671836 is a wasteful number, since it uses less digits than its factorization.

671836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15284 (or 15282 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 671836 is about 819.6560254155. The cubic root of 671836 is about 87.5832568099.

The spelling of 671836 in words is "six hundred seventy-one thousand, eight hundred thirty-six".