2129889 has 4 divisors (see below), whose sum is σ = 2839856. Its totient is φ = 1419924.

The previous prime is 2129887. The next prime is 2129891. The reversal of 2129889 is 9889212.

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 an interprime number because it is at equal distance from previous prime (2129887) and next prime (2129891).

It is not a de Polignac number, because 2129889 - 2¹ = 2129887 is a prime.

It is a D-number.

It is a Duffinian number.

2129889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2129887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354979 + ... + 354984.

It is an arithmetic number, because the mean of its divisors is an integer number (709964).

2^2129889 is an apocalyptic number.

It is an amenable number.

2129889 is a deficient number, since it is larger than the sum of its proper divisors (709967).

2129889 is an equidigital number, since it uses as much as digits as its factorization.

2129889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709966.

The product of its digits is 20736, while the sum is 39.

The square root of 2129889 is about 1459.4139234638. The cubic root of 2129889 is about 128.6626000606.

It can be divided in two parts, 212 and 9889, that added together give a palindrome (10101).

The spelling of 2129889 in words is "two million, one hundred twenty-nine thousand, eight hundred eighty-nine".