1999131992 has 48 divisors (see below), whose sum is σ = 4437071520. Its totient is φ = 838791360.

The previous prime is 1999131977. The next prime is 1999132001. The reversal of 1999131992 is 2991319991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66848 + ... + 92015.

It is an arithmetic number, because the mean of its divisors is an integer number (92438990).

Almost surely, 2^1999131992 is an apocalyptic number.

It is an amenable number.

1999131992 is an abundant number, since it is smaller than the sum of its proper divisors (2437939528).

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

1999131992 is a wasteful number, since it uses less digits than its factorization.

1999131992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158904 (or 158889 counting only the distinct ones).

The product of its digits is 354294, while the sum is 53.

The square root of 1999131992 is about 44711.6538723407. The cubic root of 1999131992 is about 1259.7387532614.

The spelling of 1999131992 in words is "one billion, nine hundred ninety-nine million, one hundred thirty-one thousand, nine hundred ninety-two".