1968990009 has 8 divisors (see below), whose sum is σ = 3000365760. Its totient is φ = 1125137136.

The previous prime is 1968989999. The next prime is 1968990041. The reversal of 1968990009 is 9000998691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1968990009 - 2⁵ = 1968989977 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1968990209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46880694 + ... + 46880735.

It is an arithmetic number, because the mean of its divisors is an integer number (375045720).

Almost surely, 2^1968990009 is an apocalyptic number.

It is an amenable number.

1968990009 is a deficient number, since it is larger than the sum of its proper divisors (1031375751).

1968990009 is an equidigital number, since it uses as much as digits as its factorization.

1968990009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93761439.

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 1968990009 is about 44373.3028858569. The cubic root of 1968990009 is about 1253.3754123224.

The spelling of 1968990009 in words is "one billion, nine hundred sixty-eight million, nine hundred ninety thousand, nine".