1989341808478 has 8 divisors (see below), whose sum is σ = 2984030414568. Its totient is φ = 994665003624.

The previous prime is 1989341808473. The next prime is 1989341808547. The reversal of 1989341808478 is 8748081439891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989341808473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2516101 + ... + 3210832.

It is an arithmetic number, because the mean of its divisors is an integer number (373003801821).

Almost surely, 2^{1989341808478} is an apocalyptic number.

1989341808478 is a deficient number, since it is larger than the sum of its proper divisors (994688606090).

1989341808478 is a wasteful number, since it uses less digits than its factorization.

1989341808478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5900618.

The product of its (nonzero) digits is 111476736, while the sum is 70.

The spelling of 1989341808478 in words is "one trillion, nine hundred eighty-nine billion, three hundred forty-one million, eight hundred eight thousand, four hundred seventy-eight".