2128939 has 4 divisors (see below), whose sum is σ = 2134440. Its totient is φ = 2123440.

The previous prime is 2128933. The next prime is 2128963. The reversal of 2128939 is 9398212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2128939 - 2¹³ = 2120747 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (2128933) 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, 2122 + ... + 2959.

It is an arithmetic number, because the mean of its divisors is an integer number (533610).

2^2128939 is an apocalyptic number.

2128939 is a deficient number, since it is larger than the sum of its proper divisors (5501).

2128939 is an equidigital number, since it uses as much as digits as its factorization.

2128939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5500.

The product of its digits is 7776, while the sum is 34.

The square root of 2128939 is about 1459.0884140449. The cubic root of 2128939 is about 128.6434679763.

The spelling of 2128939 in words is "two million, one hundred twenty-eight thousand, nine hundred thirty-nine".