1608665 has 4 divisors (see below), whose sum is σ = 1930404. Its totient is φ = 1286928.

The previous prime is 1608661. The next prime is 1608667. The reversal of 1608665 is 5668061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 994009 = 784^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608665 - 2² = 1608661 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 (1608661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160862 + ... + 160871.

It is an arithmetic number, because the mean of its divisors is an integer number (482601).

2^1608665 is an apocalyptic number.

It is an amenable number.

1608665 is a deficient number, since it is larger than the sum of its proper divisors (321739).

1608665 is an equidigital number, since it uses as much as digits as its factorization.

1608665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321738.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1608665 is about 1268.3315812515. The cubic root of 1608665 is about 117.1714679698.

The spelling of 1608665 in words is "one million, six hundred eight thousand, six hundred sixty-five".