1685389 has 4 divisors (see below), whose sum is σ = 1701856. Its totient is φ = 1668924.

The previous prime is 1685381. The next prime is 1685399. The reversal of 1685389 is 9835861.

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 a cyclic number.

It is not a de Polignac number, because 1685389 - 2³ = 1685381 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 (1685381) 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, 8079 + ... + 8284.

It is an arithmetic number, because the mean of its divisors is an integer number (425464).

2^1685389 is an apocalyptic number.

It is an amenable number.

1685389 is a deficient number, since it is larger than the sum of its proper divisors (16467).

1685389 is a wasteful number, since it uses less digits than its factorization.

1685389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16466.

The product of its digits is 51840, while the sum is 40.

The square root of 1685389 is about 1298.2253271293. The cubic root of 1685389 is about 119.0054136840.

The spelling of 1685389 in words is "one million, six hundred eighty-five thousand, three hundred eighty-nine".