2189729520 has 240 divisors, whose sum is σ = 8079911424. Its totient is φ = 527040000.

The previous prime is 2189729519. The next prime is 2189729527. The reversal of 2189729520 is 259279812.

It is a happy number.

2189729520 is a `hidden beast` number, since 2 + 18 + 97 + 29 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189729527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1195005 + ... + 1196835.

Almost surely, 2^2189729520 is an apocalyptic number.

2189729520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2189729520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4039955712).

2189729520 is an abundant number, since it is smaller than the sum of its proper divisors (5890181904).

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

2189729520 is a wasteful number, since it uses less digits than its factorization.

2189729520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012 (or 2003 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 2189729520 is about 46794.5458360267. The cubic root of 2189729520 is about 1298.5643955057.

The spelling of 2189729520 in words is "two billion, one hundred eighty-nine million, seven hundred twenty-nine thousand, five hundred twenty".