1999996878 has 32 divisors (see below), whose sum is σ = 4553356032. Its totient is φ = 579708800.

The previous prime is 1999996871. The next prime is 1999996879. The reversal of 1999996878 is 8786999991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999996871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657243 + ... + 660278.

It is an arithmetic number, because the mean of its divisors is an integer number (142292376).

Almost surely, 2^1999996878 is an apocalyptic number.

1999996878 is an abundant number, since it is smaller than the sum of its proper divisors (2553359154).

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

1999996878 is a wasteful number, since it uses less digits than its factorization.

1999996878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317560.

The product of its digits is 158723712, while the sum is 75.

The square root of 1999996878 is about 44721.3246449610. The cubic root of 1999996878 is about 1259.9203943156.

The spelling of 1999996878 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-six thousand, eight hundred seventy-eight".