1889666380 has 72 divisors (see below), whose sum is σ = 4765170816. Its totient is φ = 626976000.

The previous prime is 1889666341. The next prime is 1889666417. The reversal of 1889666380 is 836669881.

It is a happy number.

1889666380 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 23 ways as a sum of consecutive naturals, for example, 721 + ... + 61480.

It is an arithmetic number, because the mean of its divisors is an integer number (66182928).

Almost surely, 2^1889666380 is an apocalyptic number.

1889666380 is a gapful number since it is divisible by the number (10) 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 1889666380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2382585408).

1889666380 is an abundant number, since it is smaller than the sum of its proper divisors (2875504436).

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

1889666380 is a wasteful number, since it uses less digits than its factorization.

1889666380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62255 (or 62246 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 1889666380 is about 43470.2930746964. The cubic root of 1889666380 is about 1236.3128373441.

The spelling of 1889666380 in words is "one billion, eight hundred eighty-nine million, six hundred sixty-six thousand, three hundred eighty".