2189789784 has 288 divisors, whose sum is σ = 7509265920. Its totient is φ = 564205824.

The previous prime is 2189789741. The next prime is 2189789827. The reversal of 2189789784 is 4879879812.

It is an interprime number because it is at equal distance from previous prime (2189789741) and next prime (2189789827).

It is a super-2 number, since 2×2189789784² = 9590358596221533312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

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 71 ways as a sum of consecutive naturals, for example, 4002999 + ... + 4003545.

It is an arithmetic number, because the mean of its divisors is an integer number (26073840).

Almost surely, 2^2189789784 is an apocalyptic number.

2189789784 is a gapful number since it is divisible by the number (24) 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 2189789784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3754632960).

2189789784 is an abundant number, since it is smaller than the sum of its proper divisors (5319476136).

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

2189789784 is a wasteful number, since it uses less digits than its factorization.

2189789784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 619 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 63.

The square root of 2189789784 is about 46795.1897527940. The cubic root of 2189789784 is about 1298.5763080830.

The spelling of 2189789784 in words is "two billion, one hundred eighty-nine million, seven hundred eighty-nine thousand, seven hundred eighty-four".