1685109 has 4 divisors (see below), whose sum is σ = 2246816. Its totient is φ = 1123404.

The previous prime is 1685107. The next prime is 1685111. The reversal of 1685109 is 9015861.

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.

It is an interprime number because it is at equal distance from previous prime (1685107) and next prime (1685111).

It is not a de Polignac number, because 1685109 - 2¹ = 1685107 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685107) 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 3 ways as a sum of consecutive naturals, for example, 280849 + ... + 280854.

It is an arithmetic number, because the mean of its divisors is an integer number (561704).

2^1685109 is an apocalyptic number.

It is an amenable number.

1685109 is a deficient number, since it is larger than the sum of its proper divisors (561707).

1685109 is an equidigital number, since it uses as much as digits as its factorization.

1685109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561706.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1685109 is about 1298.1174831270. The cubic root of 1685109 is about 118.9988230470.

The spelling of 1685109 in words is "one million, six hundred eighty-five thousand, one hundred nine".