1989110640 has 160 divisors (see below), whose sum is σ = 6748425216. Its totient is φ = 480660480.

The previous prime is 1989110603. The next prime is 1989110659. The reversal of 1989110640 is 460119891.

It is a super-2 number, since 2×1989110640² = 7913122276322419200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 967854 + ... + 969906.

Almost surely, 2^1989110640 is an apocalyptic number.

1989110640 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 1989110640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3374212608).

1989110640 is an abundant number, since it is smaller than the sum of its proper divisors (4759314576).

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

1989110640 is a wasteful number, since it uses less digits than its factorization.

1989110640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447 (or 2441 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 1989110640 is about 44599.4466333384. The cubic root of 1989110640 is about 1257.6302650066.

The spelling of 1989110640 in words is "one billion, nine hundred eighty-nine million, one hundred ten thousand, six hundred forty".