2159778 has 16 divisors (see below), whose sum is σ = 4379616. Its totient is φ = 709920.

The previous prime is 2159771. The next prime is 2159779. The reversal of 2159778 is 8779512.

It is not an unprimeable number, because it can be changed into a prime (2159771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2028 + ... + 2903.

It is an arithmetic number, because the mean of its divisors is an integer number (273726).

2^2159778 is an apocalyptic number.

2159778 is an abundant number, since it is smaller than the sum of its proper divisors (2219838).

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

2159778 is a wasteful number, since it uses less digits than its factorization.

2159778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5009.

The product of its digits is 35280, while the sum is 39.

The square root of 2159778 is about 1469.6183177955. The cubic root of 2159778 is about 129.2616526900.

The spelling of 2159778 in words is "two million, one hundred fifty-nine thousand, seven hundred seventy-eight".