1609685 has 32 divisors (see below), whose sum is σ = 2495232. Its totient is φ = 967680.

The previous prime is 1609669. The next prime is 1609691. The reversal of 1609685 is 5869061.

It is not a de Polignac number, because 1609685 - 2⁴ = 1609669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14189 + ... + 14301.

It is an arithmetic number, because the mean of its divisors is an integer number (77976).

2^1609685 is an apocalyptic number.

It is an amenable number.

1609685 is a deficient number, since it is larger than the sum of its proper divisors (885547).

1609685 is a wasteful number, since it uses less digits than its factorization.

1609685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1609685 is about 1268.7336205839. The cubic root of 1609685 is about 117.1962275574.

The spelling of 1609685 in words is "one million, six hundred nine thousand, six hundred eighty-five".