2159864 has 16 divisors (see below), whose sum is σ = 4628400. Its totient is φ = 925632.

The previous prime is 2159831. The next prime is 2159881. The reversal of 2159864 is 4689512.

2159864 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×2159864⁴ (a number of 26 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19229 + ... + 19340.

It is an arithmetic number, because the mean of its divisors is an integer number (289275).

2^2159864 is an apocalyptic number.

It is an amenable number.

2159864 is an abundant number, since it is smaller than the sum of its proper divisors (2468536).

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

2159864 is a wasteful number, since it uses less digits than its factorization.

2159864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38582 (or 38578 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 2159864 is about 1469.6475768020. The cubic root of 2159864 is about 129.2633683531.

The spelling of 2159864 in words is "two million, one hundred fifty-nine thousand, eight hundred sixty-four".