1606005 has 24 divisors (see below), whose sum is σ = 2822040. Its totient is φ = 844800.

The previous prime is 1605979. The next prime is 1606009. The reversal of 1606005 is 5006061.

Added to its reverse (5006061) it gives a triangular number (6612066 = T₃₆₃₆).

1606005 is a `hidden beast` number, since 1 + 60 + 600 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 367236 + 1238769 = 606^2 + 1113^2 .

It is not a de Polignac number, because 1606005 - 2⁶ = 1605941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606009) 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, 3805 + ... + 4205.

It is an arithmetic number, because the mean of its divisors is an integer number (117585).

2^1606005 is an apocalyptic number.

1606005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1606005 is a deficient number, since it is larger than the sum of its proper divisors (1216035).

1606005 is a wasteful number, since it uses less digits than its factorization.

1606005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1606005 is about 1267.2825257219. The cubic root of 1606005 is about 117.1068495744.

Adding to 1606005 its reverse (5006061), we get a triangular number (6612066 = T₃₆₃₆).

The spelling of 1606005 in words is "one million, six hundred six thousand, five".