1685668 has 6 divisors (see below), whose sum is σ = 2949926. Its totient is φ = 842832.

The previous prime is 1685627. The next prime is 1685681. The reversal of 1685668 is 8665861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1557504 + 128164 = 1248^2 + 358^2 .

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1685668.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210705 + ... + 210712.

2^1685668 is an apocalyptic number.

It is an amenable number.

1685668 is a deficient number, since it is larger than the sum of its proper divisors (1264258).

1685668 is a wasteful number, since it uses less digits than its factorization.

1685668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421421 (or 421419 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 1685668 is about 1298.3327770645. The cubic root of 1685668 is about 119.0119800570.

The spelling of 1685668 in words is "one million, six hundred eighty-five thousand, six hundred sixty-eight".