671445 has 24 divisors (see below), whose sum is σ = 1194336. Its totient is φ = 348768.

The previous prime is 671443. The next prime is 671467. The reversal of 671445 is 544176.

It is not a de Polignac number, because 671445 - 2¹ = 671443 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1762 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (49764).

2⁶⁷¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

671445 is a deficient number, since it is larger than the sum of its proper divisors (522891).

671445 is a wasteful number, since it uses less digits than its factorization.

671445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 398 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 671445 is about 819.4174760157. The cubic root of 671445 is about 87.5662627325.

The spelling of 671445 in words is "six hundred seventy-one thousand, four hundred forty-five".