2129989 has 4 divisors (see below), whose sum is σ = 2151180. Its totient is φ = 2108800.

The previous prime is 2129983. The next prime is 2130001. The reversal of 2129989 is 9899212.

2129989 = T₃₂ + T₃₃ + ... + T₂₃₃.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2079364 + 50625 = 1442^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129989 - 2⁷ = 2129861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10444 + ... + 10645.

It is an arithmetic number, because the mean of its divisors is an integer number (537795).

2^2129989 is an apocalyptic number.

It is an amenable number.

2129989 is a deficient number, since it is larger than the sum of its proper divisors (21191).

2129989 is a wasteful number, since it uses less digits than its factorization.

2129989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21190.

The product of its digits is 23328, while the sum is 40.

The square root of 2129989 is about 1459.4481833899. The cubic root of 2129989 is about 128.6646136332.

It can be divided in two parts, 212 and 9989, that added together give a palindrome (10201).

The spelling of 2129989 in words is "two million, one hundred twenty-nine thousand, nine hundred eighty-nine".