1999169712 has 60 divisors (see below), whose sum is σ = 5611162440. Its totient is φ = 664452864.

The previous prime is 1999169701. The next prime is 1999169713. The reversal of 1999169712 is 2179619991.

It is not an unprimeable number, because it can be changed into a prime (1999169713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29964 + ... + 69972.

It is an arithmetic number, because the mean of its divisors is an integer number (93519374).

Almost surely, 2^1999169712 is an apocalyptic number.

1999169712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999169712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2805581220).

1999169712 is an abundant number, since it is smaller than the sum of its proper divisors (3611992728).

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

1999169712 is a wasteful number, since it uses less digits than its factorization.

1999169712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40370 (or 40361 counting only the distinct ones).

The product of its digits is 551124, while the sum is 54.

The square root of 1999169712 is about 44712.0756843160. The cubic root of 1999169712 is about 1259.7466762078.

It can be divided in two parts, 199916 and 9712, that added together give a triangular number (209628 = T₆₄₇).

The spelling of 1999169712 in words is "one billion, nine hundred ninety-nine million, one hundred sixty-nine thousand, seven hundred twelve".