1999987689436 has 24 divisors (see below), whose sum is σ = 3857520781296. Its totient is φ = 899713297920.

The previous prime is 1999987689433. The next prime is 1999987689437. The reversal of 1999987689436 is 6349867899991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999987689433) 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, 234296071 + ... + 234304606.

It is an arithmetic number, because the mean of its divisors is an integer number (160730032554).

Almost surely, 2^{1999987689436} is an apocalyptic number.

It is an amenable number.

1999987689436 is a deficient number, since it is larger than the sum of its proper divisors (1857533091860).

1999987689436 is a wasteful number, since it uses less digits than its factorization.

1999987689436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468600789 (or 468600787 counting only the distinct ones).

The product of its digits is 11428107264, while the sum is 88.

The spelling of 1999987689436 in words is "one trillion, nine hundred ninety-nine billion, nine hundred eighty-seven million, six hundred eighty-nine thousand, four hundred thirty-six".