2123985889 has 4 divisors (see below), whose sum is σ = 2235774640. Its totient is φ = 2012197140.

The previous prime is 2123985859. The next prime is 2123985893. The reversal of 2123985889 is 9885893212.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2123985889 - 2¹³ = 2123977697 is a prime.

It is a super-2 number, since 2×2123985889² = 9022632113342240642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123985859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55894347 + ... + 55894384.

It is an arithmetic number, because the mean of its divisors is an integer number (558943660).

Almost surely, 2^2123985889 is an apocalyptic number.

It is an amenable number.

2123985889 is a deficient number, since it is larger than the sum of its proper divisors (111788751).

2123985889 is a wasteful number, since it uses less digits than its factorization.

2123985889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111788750.

The product of its digits is 2488320, while the sum is 55.

The square root of 2123985889 is about 46086.7213956471. The cubic root of 2123985889 is about 1285.4362478894.

The spelling of 2123985889 in words is "two billion, one hundred twenty-three million, nine hundred eighty-five thousand, eight hundred eighty-nine".