3128740 has 12 divisors (see below), whose sum is σ = 6570396. Its totient is φ = 1251488.

The previous prime is 3128729. The next prime is 3128747. The reversal of 3128740 is 478213.

It can be written as a sum of positive squares in 2 ways, for example, as 1218816 + 1909924 = 1104^2 + 1382^2 .

It is not an unprimeable number, because it can be changed into a prime (3128747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78199 + ... + 78238.

It is an arithmetic number, because the mean of its divisors is an integer number (547533).

Almost surely, 2^3128740 is an apocalyptic number.

It is an amenable number.

3128740 is an abundant number, since it is smaller than the sum of its proper divisors (3441656).

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

3128740 is a wasteful number, since it uses less digits than its factorization.

3128740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156446 (or 156444 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 3128740 is about 1768.8244683970. The cubic root of 3128740 is about 146.2591880657.

The spelling of 3128740 in words is "three million, one hundred twenty-eight thousand, seven hundred forty".