1989211392 has 144 divisors (see below), whose sum is σ = 6722961280. Its totient is φ = 568332288.

The previous prime is 1989211387. The next prime is 1989211421. The reversal of 1989211392 is 2931129891.

It is a tau number, because it is divible by the number of its divisors (144).

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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27828 + ... + 68940.

Almost surely, 2^1989211392 is an apocalyptic number.

1989211392 is a gapful number since it is divisible by the number (12) 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 1989211392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3361480640).

1989211392 is an abundant number, since it is smaller than the sum of its proper divisors (4733749888).

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

1989211392 is an equidigital number, since it uses as much as digits as its factorization.

1989211392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41145 (or 41125 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 1989211392 is about 44600.5761397765. The cubic root of 1989211392 is about 1257.6514983864.

The spelling of 1989211392 in words is "one billion, nine hundred eighty-nine million, two hundred eleven thousand, three hundred ninety-two".