671946 has 16 divisors (see below), whose sum is σ = 1466208. Its totient is φ = 203600.

The previous prime is 671941. The next prime is 671947. The reversal of 671946 is 649176.

It is a happy number.

It is a super-2 number, since 2×671946² = 903022853832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

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

671946 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 7 ways as a sum of consecutive naturals, for example, 5025 + ... + 5156.

It is an arithmetic number, because the mean of its divisors is an integer number (91638).

2⁶⁷¹⁹⁴⁶ is an apocalyptic number.

671946 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

671946 is an abundant number, since it is smaller than the sum of its proper divisors (794262).

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

671946 is a wasteful number, since it uses less digits than its factorization.

671946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10197.

The product of its digits is 9072, while the sum is 33.

The square root of 671946 is about 819.7231239876. The cubic root of 671946 is about 87.5880365639.

The spelling of 671946 in words is "six hundred seventy-one thousand, nine hundred forty-six".