2128861 has 8 divisors (see below), whose sum is σ = 2517120. Its totient is φ = 1761648.

The previous prime is 2128849. The next prime is 2128871. The reversal of 2128861 is 1688212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2128861 - 2⁷ = 2128733 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5041 + ... + 5446.

It is an arithmetic number, because the mean of its divisors is an integer number (314640).

2^2128861 is an apocalyptic number.

It is an amenable number.

2128861 is a deficient number, since it is larger than the sum of its proper divisors (388259).

2128861 is a wasteful number, since it uses less digits than its factorization.

2128861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10523.

The product of its digits is 1536, while the sum is 28.

The square root of 2128861 is about 1459.0616847824. The cubic root of 2128861 is about 128.6418968787.

It can be divided in two parts, 21 and 28861, that added together give a palindrome (28882).

The spelling of 2128861 in words is "two million, one hundred twenty-eight thousand, eight hundred sixty-one".