2163839 has 4 divisors (see below), whose sum is σ = 2175360. Its totient is φ = 2152320.

The previous prime is 2163829. The next prime is 2163851. The reversal of 2163839 is 9383612.

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

It is a cyclic number.

It is not a de Polignac number, because 2163839 - 2⁴ = 2163823 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 (2163809) 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, 5474 + ... + 5855.

It is an arithmetic number, because the mean of its divisors is an integer number (543840).

2^2163839 is an apocalyptic number.

2163839 is a deficient number, since it is larger than the sum of its proper divisors (11521).

2163839 is a wasteful number, since it uses less digits than its factorization.

2163839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11520.

The product of its digits is 7776, while the sum is 32.

The square root of 2163839 is about 1470.9993201902. Note that the first 3 decimals coincide. The cubic root of 2163839 is about 129.3426182503.

The spelling of 2163839 in words is "two million, one hundred sixty-three thousand, eight hundred thirty-nine".