2128369 has 4 divisors (see below), whose sum is σ = 2154096. Its totient is φ = 2102644.

The previous prime is 2128333. The next prime is 2128381. The reversal of 2128369 is 9638212.

2128369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2128369 - 2⁷ = 2128241 is a prime.

It is a super-2 number, since 2×2128369² = 9059909200322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 2⁹ + 1 + 2¹¹ + 8 + 3¹³ + 6² + 9⁶ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2128369.

It is not an unprimeable number, because it can be changed into a prime (2128309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12739 + ... + 12904.

It is an arithmetic number, because the mean of its divisors is an integer number (538524).

2^2128369 is an apocalyptic number.

It is an amenable number.

2128369 is a deficient number, since it is larger than the sum of its proper divisors (25727).

2128369 is an equidigital number, since it uses as much as digits as its factorization.

2128369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25726.

The product of its digits is 5184, while the sum is 31.

The square root of 2128369 is about 1458.8930735321. The cubic root of 2128369 is about 128.6319859937.

The spelling of 2128369 in words is "two million, one hundred twenty-eight thousand, three hundred sixty-nine".