1995840009 has 12 divisors (see below), whose sum is σ = 3034610800. Its totient is φ = 1260530424.

The previous prime is 1995839999. The next prime is 1995840043. The reversal of 1995840009 is 9000485991.

1995840009 is a `hidden beast` number, since 199 + 58 + 400 + 0 + 9 = 666.

It is not a de Polignac number, because 1995840009 - 2¹⁷ = 1995708937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1995840079) 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, 5835619 + ... + 5835960.

Almost surely, 2^1995840009 is an apocalyptic number.

1995840009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1995840009 is a deficient number, since it is larger than the sum of its proper divisors (1038770791).

1995840009 is a wasteful number, since it uses less digits than its factorization.

1995840009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671604 (or 11671601 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 1995840009 is about 44674.8252262950. The cubic root of 1995840009 is about 1259.0469001672.

The spelling of 1995840009 in words is "one billion, nine hundred ninety-five million, eight hundred forty thousand, nine".