1989922144 has 72 divisors (see below), whose sum is σ = 4568786208. Its totient is φ = 850671360.

The previous prime is 1989922139. The next prime is 1989922159. The reversal of 1989922144 is 4412299891.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 724614 + ... + 727354.

It is an arithmetic number, because the mean of its divisors is an integer number (63455364).

Almost surely, 2^1989922144 is an apocalyptic number.

1989922144 is a gapful number since it is divisible by the number (14) 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 1989922144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2284393104).

1989922144 is an abundant number, since it is smaller than the sum of its proper divisors (2578864064).

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

1989922144 is a wasteful number, since it uses less digits than its factorization.

1989922144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228 (or 3213 counting only the distinct ones).

The product of its digits is 373248, while the sum is 49.

The square root of 1989922144 is about 44608.5433969772. The cubic root of 1989922144 is about 1257.8012682702.

The spelling of 1989922144 in words is "one billion, nine hundred eighty-nine million, nine hundred twenty-two thousand, one hundred forty-four".