3128985 has 24 divisors (see below), whose sum is σ = 5601024. Its totient is φ = 1614240.

The previous prime is 3128941. The next prime is 3128987. The reversal of 3128985 is 5898213.

It is not a de Polignac number, because 3128985 - 2⁶ = 3128921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3128987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274 + ... + 2516.

It is an arithmetic number, because the mean of its divisors is an integer number (233376).

Almost surely, 2^3128985 is an apocalyptic number.

It is an amenable number.

3128985 is a deficient number, since it is larger than the sum of its proper divisors (2472039).

3128985 is a wasteful number, since it uses less digits than its factorization.

3128985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285 (or 2282 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 3128985 is about 1768.8937220760. The cubic root of 3128985 is about 146.2630056372.

The spelling of 3128985 in words is "three million, one hundred twenty-eight thousand, nine hundred eighty-five".