3128743 has 4 divisors (see below), whose sum is σ = 3195360. Its totient is φ = 3062128.

The previous prime is 3128729. The next prime is 3128747. The reversal of 3128743 is 3478213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3478213 = 1283 ⋅2711.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3128743 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 3 ways as a sum of consecutive naturals, for example, 33238 + ... + 33331.

It is an arithmetic number, because the mean of its divisors is an integer number (798840).

Almost surely, 2^3128743 is an apocalyptic number.

3128743 is a deficient number, since it is larger than the sum of its proper divisors (66617).

3128743 is an equidigital number, since it uses as much as digits as its factorization.

3128743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66616.

The product of its digits is 4032, while the sum is 28.

The square root of 3128743 is about 1768.8253164177. The cubic root of 3128743 is about 146.2592348127.

The spelling of 3128743 in words is "three million, one hundred twenty-eight thousand, seven hundred forty-three".