1685128 has 16 divisors (see below), whose sum is σ = 3245580. Its totient is φ = 819648.

The previous prime is 1685119. The next prime is 1685153. The reversal of 1685128 is 8215861.

It can be written as a sum of positive squares in 2 ways, for example, as 1684804 + 324 = 1298^2 + 18^2 .

It is a plaindrome in base 15.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 1685128.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2551 + ... + 3142.

2^1685128 is an apocalyptic number.

It is an amenable number.

1685128 is a deficient number, since it is larger than the sum of its proper divisors (1560452).

1685128 is a wasteful number, since it uses less digits than its factorization.

1685128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5736 (or 5732 counting only the distinct ones).

The product of its digits is 3840, while the sum is 31.

The square root of 1685128 is about 1298.1248013962. The cubic root of 1685128 is about 118.9992702919. Note that the first 3 decimals are identical.

Adding to 1685128 its sum of digits (31), we get a cube (1685159 = 119³).

The spelling of 1685128 in words is "one million, six hundred eighty-five thousand, one hundred twenty-eight".