999981712 has 20 divisors (see below), whose sum is σ = 2004274620. Its totient is φ = 482749568.

The previous prime is 999981659. The next prime is 999981713. The reversal of 999981712 is 217189999.

It can be written as a sum of positive squares in 2 ways, for example, as 793886976 + 206094736 = 28176^2 + 14356^2 .

It is not an unprimeable number, because it can be changed into a prime (999981713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077103 + ... + 1078030.

It is an arithmetic number, because the mean of its divisors is an integer number (100213731).

Almost surely, 2^999981712 is an apocalyptic number.

It is an amenable number.

999981712 is an abundant number, since it is smaller than the sum of its proper divisors (1004292908).

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

999981712 is a wasteful number, since it uses less digits than its factorization.

999981712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155170 (or 2155164 counting only the distinct ones).

The product of its digits is 734832, while the sum is 55.

The square root of 999981712 is about 31622.4874416925. The cubic root of 999981712 is about 999.9939039628.

The spelling of 999981712 in words is "nine hundred ninety-nine million, nine hundred eighty-one thousand, seven hundred twelve".