2188729 has 2 divisors, whose sum is σ = 2188730. Its totient is φ = 2188728.

The previous prime is 2188691. The next prime is 2188751. The reversal of 2188729 is 9278812.

2188729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1795600 + 393129 = 1340^2 + 627^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188729 - 2¹³ = 2180537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2188789) 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 as a sum of consecutive naturals, namely, 1094364 + 1094365.

It is an arithmetic number, because the mean of its divisors is an integer number (1094365).

2^2188729 is an apocalyptic number.

It is an amenable number.

2188729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188729 is an equidigital number, since it uses as much as digits as its factorization.

2188729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 2188729 is about 1479.4353652661. The cubic root of 2188729 is about 129.8366587577.

The spelling of 2188729 in words is "two million, one hundred eighty-eight thousand, seven hundred twenty-nine".