1605943 has 6 divisors (see below), whose sum is σ = 1643096. Its totient is φ = 1569612.

The previous prime is 1605941. The next prime is 1605971. The reversal of 1605943 is 3495061.

It is not a de Polignac number, because 1605943 - 2¹ = 1605941 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 (1605941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1846 + ... + 2572.

2^1605943 is an apocalyptic number.

1605943 is a deficient number, since it is larger than the sum of its proper divisors (37153).

1605943 is an frugal number, since it uses more digits than its factorization.

1605943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1605943 is about 1267.2580636950. The cubic root of 1605943 is about 117.1053425807.

The spelling of 1605943 in words is "one million, six hundred five thousand, nine hundred forty-three".