1605106 has 12 divisors (see below), whose sum is σ = 2558538. Its totient is φ = 755072.

The previous prime is 1605103. The next prime is 1605127. The reversal of 1605106 is 6015061.

It can be written as a sum of positive squares in 3 ways, for example, as 1476225 + 128881 = 1215^2 + 359^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1605103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 811 + ... + 1966.

2^1605106 is an apocalyptic number.

1605106 is a deficient number, since it is larger than the sum of its proper divisors (953432).

1605106 is a wasteful number, since it uses less digits than its factorization.

1605106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813 (or 2796 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1605106 is about 1266.9277801043. The cubic root of 1605106 is about 117.0849943689.

It can be divided in two parts, 1605 and 106, that added together give a triangular number (1711 = T₅₈).

The spelling of 1605106 in words is "one million, six hundred five thousand, one hundred six".