2189523456 has 240 divisors, whose sum is σ = 6707802816. Its totient is φ = 686112768.

The previous prime is 2189523437. The next prime is 2189523481. The reversal of 2189523456 is 6543259812.

2189523456 is a `hidden beast` number, since 2 + 1 + 89 + 523 + 45 + 6 = 666.

Its product of digits (518400) is a multiple of the sum of its prime divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7736691 + ... + 7736973.

Almost surely, 2^2189523456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2189523456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3353901408).

2189523456 is an abundant number, since it is smaller than the sum of its proper divisors (4518279360).

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

2189523456 is a wasteful number, since it uses less digits than its factorization.

2189523456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 384 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 2189523456 is about 46792.3439891613. The cubic root of 2189523456 is about 1298.5236605252.

The spelling of 2189523456 in words is "two billion, one hundred eighty-nine million, five hundred twenty-three thousand, four hundred fifty-six".