1989812064240 has 800 divisors, whose sum is σ = 9279017104896. Its totient is φ = 381661009920.

The previous prime is 1989812064221. The next prime is 1989812064311. The reversal of 1989812064240 is 424602189891.

It is a happy number.

1989812064240 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 8 + 1 + 206 + 424 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 6333099 + ... + 6639861.

Almost surely, 2^{1989812064240} is an apocalyptic number.

1989812064240 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 1989812064240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4639508552448).

1989812064240 is an abundant number, since it is smaller than the sum of its proper divisors (7289205040656).

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

1989812064240 is a wasteful number, since it uses less digits than its factorization.

1989812064240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306819 (or 306804 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 1989812064240 in words is "one trillion, nine hundred eighty-nine billion, eight hundred twelve million, sixty-four thousand, two hundred forty".