2128689 has 12 divisors (see below), whose sum is σ = 3255876. Its totient is φ = 1335552.

The previous prime is 2128669. The next prime is 2128697. The reversal of 2128689 is 9868212.

It can be written as a sum of positive squares in 2 ways, for example, as 1520289 + 608400 = 1233^2 + 780^2 .

It is not a de Polignac number, because 2128689 - 2⁷ = 2128561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2128649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6804 + ... + 7109.

It is an arithmetic number, because the mean of its divisors is an integer number (271323).

2^2128689 is an apocalyptic number.

It is an amenable number.

2128689 is a deficient number, since it is larger than the sum of its proper divisors (1127187).

2128689 is a wasteful number, since it uses less digits than its factorization.

2128689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13936 (or 13933 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 2128689 is about 1459.0027416013. The cubic root of 2128689 is about 128.6384322714.

The spelling of 2128689 in words is "two million, one hundred twenty-eight thousand, six hundred eighty-nine".