2189124978 has 16 divisors (see below), whose sum is σ = 4384763616. Its totient is φ = 728622720.

The previous prime is 2189124961. The next prime is 2189124989. The reversal of 2189124978 is 8794219812.

It is a happy number.

2189124978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2189124978.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267028 + ... + 275103.

It is an arithmetic number, because the mean of its divisors is an integer number (274047726).

Almost surely, 2^2189124978 is an apocalyptic number.

2189124978 is an abundant number, since it is smaller than the sum of its proper divisors (2195638638).

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

2189124978 is a wasteful number, since it uses less digits than its factorization.

2189124978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542809.

The product of its digits is 580608, while the sum is 51.

The square root of 2189124978 is about 46788.0858552688. The cubic root of 2189124978 is about 1298.4448816623. Note that the first 3 decimals are identical.

The spelling of 2189124978 in words is "two billion, one hundred eighty-nine million, one hundred twenty-four thousand, nine hundred seventy-eight".