1968840009 has 6 divisors (see below), whose sum is σ = 2843880026. Its totient is φ = 1312560000.

The previous prime is 1968840007. The next prime is 1968840031. The reversal of 1968840009 is 9000488691.

It can be written as a sum of positive squares in only one way, i.e., 1876622400 + 92217609 = 43320^2 + 9603^2 .

It is not a de Polignac number, because 1968840009 - 2¹ = 1968840007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968840007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109379992 + ... + 109380009.

Almost surely, 2^1968840009 is an apocalyptic number.

It is an amenable number.

1968840009 is a deficient number, since it is larger than the sum of its proper divisors (875040017).

1968840009 is a wasteful number, since it uses less digits than its factorization.

1968840009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218760007 (or 218760004 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1968840009 is about 44371.6126481786. The cubic root of 1968840009 is about 1253.3435836377.

The spelling of 1968840009 in words is "one billion, nine hundred sixty-eight million, eight hundred forty thousand, nine".