3128749 has 16 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 2673216.

The previous prime is 3128747. The next prime is 3128761. The reversal of 3128749 is 9478213.

It is not a de Polignac number, because 3128749 - 2¹ = 3128747 is a prime.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 12972 + ... + 13210.

It is an arithmetic number, because the mean of its divisors is an integer number (226800).

Almost surely, 2^3128749 is an apocalyptic number.

It is an amenable number.

3128749 is a deficient number, since it is larger than the sum of its proper divisors (500051).

3128749 is a wasteful number, since it uses less digits than its factorization.

3128749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324.

The product of its digits is 12096, while the sum is 34.

The square root of 3128749 is about 1768.8270124577. The cubic root of 3128749 is about 146.2593283065.

The spelling of 3128749 in words is "three million, one hundred twenty-eight thousand, seven hundred forty-nine".