1989227472 has 80 divisors (see below), whose sum is σ = 5271805440. Its totient is φ = 645998976.

The previous prime is 1989227453. The next prime is 1989227491. The reversal of 1989227472 is 2747229891.

It is an interprime number because it is at equal distance from previous prime (1989227453) and next prime (1989227491).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004179 + ... + 1006157.

It is an arithmetic number, because the mean of its divisors is an integer number (65897568).

Almost surely, 2^1989227472 is an apocalyptic number.

1989227472 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 1989227472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2635902720).

1989227472 is an abundant number, since it is smaller than the sum of its proper divisors (3282577968).

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

1989227472 is a wasteful number, since it uses less digits than its factorization.

1989227472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2520 (or 2514 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 51.

The square root of 1989227472 is about 44600.7564061418. The cubic root of 1989227472 is about 1257.6548871635.

The spelling of 1989227472 in words is "one billion, nine hundred eighty-nine million, two hundred twenty-seven thousand, four hundred seventy-two".