1998281081406 has 16 divisors (see below), whose sum is σ = 3996591210000. Its totient is φ = 666088852608.

The previous prime is 1998281081399. The next prime is 1998281081417. The reversal of 1998281081406 is 6041801828991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258381 + ... + 2015768.

It is an arithmetic number, because the mean of its divisors is an integer number (249786950625).

Almost surely, 2^{1998281081406} is an apocalyptic number.

1998281081406 is an abundant number, since it is smaller than the sum of its proper divisors (1998310128594).

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

1998281081406 is a wasteful number, since it uses less digits than its factorization.

1998281081406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420603.

The product of its (nonzero) digits is 1990656, while the sum is 57.

The spelling of 1998281081406 in words is "one trillion, nine hundred ninety-eight billion, two hundred eighty-one million, eighty-one thousand, four hundred six".