1980390261408 has 48 divisors (see below), whose sum is σ = 5598410934816. Its totient is φ = 609350849280.

The previous prime is 1980390261397. The next prime is 1980390261431. The reversal of 1980390261408 is 8041620930891.

It is a tau number, because it is divible by the number of its divisors (48).

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 7 ways as a sum of consecutive naturals, for example, 793424338 + ... + 793426833.

It is an arithmetic number, because the mean of its divisors is an integer number (116633561142).

Almost surely, 2^{1980390261408} is an apocalyptic number.

It is an amenable number.

1980390261408 is an abundant number, since it is smaller than the sum of its proper divisors (3618020673408).

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

1980390261408 is a wasteful number, since it uses less digits than its factorization.

1980390261408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586851197 (or 1586851189 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 1980390261408 in words is "one trillion, nine hundred eighty billion, three hundred ninety million, two hundred sixty-one thousand, four hundred eight".