671949 has 16 divisors (see below), whose sum is σ = 1021440. Its totient is φ = 436320.

The previous prime is 671947. The next prime is 671969. The reversal of 671949 is 949176.

It is not a de Polignac number, because 671949 - 2¹ = 671947 is a prime.

It is a Curzon number.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804 + ... + 1410.

It is an arithmetic number, because the mean of its divisors is an integer number (63840).

2⁶⁷¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

671949 is a deficient number, since it is larger than the sum of its proper divisors (349491).

671949 is a wasteful number, since it uses less digits than its factorization.

671949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 651 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 671949 is about 819.7249538717. The cubic root of 671949 is about 87.5881669136.

It can be divided in two parts, 67 and 1949, that added together give a triangular number (2016 = T₆₃).

The spelling of 671949 in words is "six hundred seventy-one thousand, nine hundred forty-nine".