1980400000000 has 198 divisors, whose sum is σ = 4949579497064. Its totient is φ = 792000000000.

The previous prime is 1980399999989. The next prime is 1980400000003. The reversal of 1980400000000 is 40891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980400000003) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 399997525 + ... + 400002475.

Almost surely, 2^{1980400000000} is an apocalyptic number.

1980400000000 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 1980400000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2474789748532).

1980400000000 is an abundant number, since it is smaller than the sum of its proper divisors (2969179497064).

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

1980400000000 is an frugal number, since it uses more digits than its factorization.

1980400000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011 (or 4958 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 1980400000000 its reverse (40891), we get a palindrome (1980400040891).

The spelling of 1980400000000 in words is "one trillion, nine hundred eighty billion, four hundred million", and thus it is an aban number.