2159868 has 12 divisors (see below), whose sum is σ = 5039720. Its totient is φ = 719952.

The previous prime is 2159831. The next prime is 2159881. The reversal of 2159868 is 8689512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89983 + ... + 90006.

2^2159868 is an apocalyptic number.

It is an amenable number.

2159868 is an abundant number, since it is smaller than the sum of its proper divisors (2879852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2159868 is a wasteful number, since it uses less digits than its factorization.

2159868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179996 (or 179994 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 2159868 is about 1469.6489376719. The cubic root of 2159868 is about 129.2634481503.

The spelling of 2159868 in words is "two million, one hundred fifty-nine thousand, eight hundred sixty-eight".