1999987965398 has 32 divisors (see below), whose sum is σ = 3139951288320. Its totient is φ = 954416530240.

The previous prime is 1999987965397. The next prime is 1999987965433. The reversal of 1999987965398 is 8935697899991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999987965397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8528843 + ... + 8760201.

It is an arithmetic number, because the mean of its divisors is an integer number (98123477760).

Almost surely, 2^{1999987965398} is an apocalyptic number.

1999987965398 is a deficient number, since it is larger than the sum of its proper divisors (1139963322922).

1999987965398 is a wasteful number, since it uses less digits than its factorization.

1999987965398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233692.

The product of its digits is 21427701120, while the sum is 92.

The spelling of 1999987965398 in words is "one trillion, nine hundred ninety-nine billion, nine hundred eighty-seven million, nine hundred sixty-five thousand, three hundred ninety-eight".