1989878836397 has 8 divisors (see below), whose sum is σ = 2031042988800. Its totient is φ = 1949132594464.

The previous prime is 1989878836333. The next prime is 1989878836399. The reversal of 1989878836397 is 7936388789891.

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

It is a cyclic number.

It is not a de Polignac number, because 1989878836397 - 2⁶ = 1989878836333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989878836399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104467997 + ... + 104487042.

It is an arithmetic number, because the mean of its divisors is an integer number (253880373600).

Almost surely, 2^{1989878836397} is an apocalyptic number.

It is an amenable number.

1989878836397 is a deficient number, since it is larger than the sum of its proper divisors (41164152403).

1989878836397 is a wasteful number, since it uses less digits than its factorization.

1989878836397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208955235.

The product of its digits is 7900913664, while the sum is 86.

The spelling of 1989878836397 in words is "one trillion, nine hundred eighty-nine billion, eight hundred seventy-eight million, eight hundred thirty-six thousand, three hundred ninety-seven".