405671 has 12 divisors (see below), whose sum is σ = 500688. Its totient is φ = 326592.

The previous prime is 405667. The next prime is 405677. The reversal of 405671 is 176504.

It is not a de Polignac number, because 405671 - 2² = 405667 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 (405677) 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, 590 + ... + 1076.

It is an arithmetic number, because the mean of its divisors is an integer number (41724).

2⁴⁰⁵⁶⁷¹ is an apocalyptic number.

405671 is a deficient number, since it is larger than the sum of its proper divisors (95017).

405671 is a wasteful number, since it uses less digits than its factorization.

405671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 405671 is about 636.9230722780. The cubic root of 405671 is about 74.0271996433.

The spelling of 405671 in words is "four hundred five thousand, six hundred seventy-one".