999997968 has 40 divisors (see below), whose sum is σ = 2719295200. Its totient is φ = 315788544.

The previous prime is 999997967. The next prime is 999998003. The reversal of 999997968 is 869799999.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 999997968.

It is not an unprimeable number, because it can be changed into a prime (999997967) 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 7 ways as a sum of consecutive naturals, for example, 547333 + ... + 549156.

It is an arithmetic number, because the mean of its divisors is an integer number (67982380).

Almost surely, 2^999997968 is an apocalyptic number.

It is an amenable number.

999997968 is an abundant number, since it is smaller than the sum of its proper divisors (1719297232).

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

999997968 is a wasteful number, since it uses less digits than its factorization.

999997968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096519 (or 1096513 counting only the distinct ones).

The product of its digits is 178564176, while the sum is 75.

The square root of 999997968 is about 31622.7444729264. The cubic root of 999997968 is about 999.9993226662. Note that the first 3 decimals are identical.

The spelling of 999997968 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, nine hundred sixty-eight".