1606705 has 4 divisors (see below), whose sum is σ = 1928052. Its totient is φ = 1285360.

The previous prime is 1606681. The next prime is 1606723. The reversal of 1606705 is 5076061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5076061 = 389 ⋅13049.

It can be written as a sum of positive squares in 2 ways, for example, as 1175056 + 431649 = 1084^2 + 657^2 .

It is not a de Polignac number, because 1606705 - 2¹⁵ = 1573937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1606705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160666 + ... + 160675.

It is an arithmetic number, because the mean of its divisors is an integer number (482013).

2^1606705 is an apocalyptic number.

It is an amenable number.

1606705 is a deficient number, since it is larger than the sum of its proper divisors (321347).

1606705 is an equidigital number, since it uses as much as digits as its factorization.

1606705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321346.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 1606705 is about 1267.5586771428. The cubic root of 1606705 is about 117.1238613288.

The spelling of 1606705 in words is "one million, six hundred six thousand, seven hundred five".