1685385 has 48 divisors (see below), whose sum is σ = 3267264. Its totient is φ = 798336.

The previous prime is 1685381. The next prime is 1685399. The reversal of 1685385 is 5835861.

1685385 = 43² + 44² + ... + 172².

It is not a de Polignac number, because 1685385 - 2² = 1685381 is a prime.

1685385 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1685381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25122 + ... + 25188.

It is an arithmetic number, because the mean of its divisors is an integer number (68068).

2^1685385 is an apocalyptic number.

1685385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1685385 is a deficient number, since it is larger than the sum of its proper divisors (1581879).

1685385 is a wasteful number, since it uses less digits than its factorization.

1685385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 131 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 1685385 is about 1298.2237865638. The cubic root of 1685385 is about 119.0053195372.

The spelling of 1685385 in words is "one million, six hundred eighty-five thousand, three hundred eighty-five".