3128312 has 32 divisors (see below), whose sum is σ = 6739200. Its totient is φ = 1346400.

The previous prime is 3128311. The next prime is 3128329. The reversal of 3128312 is 2138213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3128311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737 + ... + 2607.

It is an arithmetic number, because the mean of its divisors is an integer number (210600).

Almost surely, 2^3128312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3128312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3369600).

3128312 is an abundant number, since it is smaller than the sum of its proper divisors (3610888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3128312 is a wasteful number, since it uses less digits than its factorization.

3128312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907 (or 1903 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 3128312 is about 1768.7034799536. The cubic root of 3128312 is about 146.2525185238.

Subtracting from 3128312 its reverse (2138213), we obtain a palindrome (990099).

The spelling of 3128312 in words is "three million, one hundred twenty-eight thousand, three hundred twelve".