1606609 has 4 divisors (see below), whose sum is σ = 1644016. Its totient is φ = 1569204.

The previous prime is 1606603. The next prime is 1606639. The reversal of 1606609 is 9066061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9066061 = 71 ⋅127691.

It is a cyclic number.

It is not a de Polignac number, because 1606609 - 2⁹ = 1606097 is a prime.

It is a Duffinian number.

1606609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1606603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18639 + ... + 18724.

It is an arithmetic number, because the mean of its divisors is an integer number (411004).

2^1606609 is an apocalyptic number.

It is an amenable number.

1606609 is a deficient number, since it is larger than the sum of its proper divisors (37407).

1606609 is an equidigital number, since it uses as much as digits as its factorization.

1606609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37406.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1606609 is about 1267.5208085077. The cubic root of 1606609 is about 117.1215285805.

The spelling of 1606609 in words is "one million, six hundred six thousand, six hundred nine".