2163989 has 4 divisors (see below), whose sum is σ = 2180640. Its totient is φ = 2147340.

The previous prime is 2163983. The next prime is 2164003. The reversal of 2163989 is 9893612.

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 2163989 - 2¹² = 2159893 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 (2163983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8129 + ... + 8390.

It is an arithmetic number, because the mean of its divisors is an integer number (545160).

2^2163989 is an apocalyptic number.

It is an amenable number.

2163989 is a deficient number, since it is larger than the sum of its proper divisors (16651).

2163989 is a wasteful number, since it uses less digits than its factorization.

2163989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16650.

The product of its digits is 23328, while the sum is 38.

The square root of 2163989 is about 1471.0503050542. The cubic root of 2163989 is about 129.3456069114.

The spelling of 2163989 in words is "two million, one hundred sixty-three thousand, nine hundred eighty-nine".