1989810318138 has 16 divisors (see below), whose sum is σ = 3979935706080. Its totient is φ = 663217594416.

The previous prime is 1989810318113. The next prime is 1989810318173. The reversal of 1989810318138 is 8318130189891.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13045768 + ... + 13197411.

It is an arithmetic number, because the mean of its divisors is an integer number (248745981630).

Almost surely, 2^{1989810318138} is an apocalyptic number.

1989810318138 is an abundant number, since it is smaller than the sum of its proper divisors (1990125387942).

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

1989810318138 is a wasteful number, since it uses less digits than its factorization.

1989810318138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26255821.

The product of its (nonzero) digits is 2985984, while the sum is 60.

The spelling of 1989810318138 in words is "one trillion, nine hundred eighty-nine billion, eight hundred ten million, three hundred eighteen thousand, one hundred thirty-eight".