391671 has 12 divisors (see below), whose sum is σ = 646672. Its totient is φ = 223776.

The previous prime is 391661. The next prime is 391679. The reversal of 391671 is 176193.

It is not a de Polignac number, because 391671 - 2⁵ = 391639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3046 + ... + 3171.

2³⁹¹⁶⁷¹ is an apocalyptic number.

391671 is a deficient number, since it is larger than the sum of its proper divisors (255001).

391671 is a wasteful number, since it uses less digits than its factorization.

391671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6230 (or 6227 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 391671 is about 625.8362405614. The cubic root of 391671 is about 73.1656337830.

The spelling of 391671 in words is "three hundred ninety-one thousand, six hundred seventy-one".