2128769 has 2 divisors, whose sum is σ = 2128770. Its totient is φ = 2128768.

The previous prime is 2128751. The next prime is 2128781. The reversal of 2128769 is 9678212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1890625 + 238144 = 1375^2 + 488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2128769 is a prime.

It is a super-2 number, since 2×2128769² = 9063314910722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2128799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064384 + 1064385.

It is an arithmetic number, because the mean of its divisors is an integer number (1064385).

2^2128769 is an apocalyptic number.

It is an amenable number.

2128769 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128769 is an equidigital number, since it uses as much as digits as its factorization.

2128769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 2128769 is about 1459.0301573305. The cubic root of 2128769 is about 128.6400437399.

The spelling of 2128769 in words is "two million, one hundred twenty-eight thousand, seven hundred sixty-nine".