133840809 has 16 divisors (see below), whose sum is σ = 199180800. Its totient is φ = 88823088.

The previous prime is 133840793. The next prime is 133840831. The reversal of 133840809 is 908048331.

It is not a de Polignac number, because 133840809 - 2⁴ = 133840793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133840849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5094 + ... + 17135.

It is an arithmetic number, because the mean of its divisors is an integer number (12448800).

Almost surely, 2^133840809 is an apocalyptic number.

It is an amenable number.

133840809 is a deficient number, since it is larger than the sum of its proper divisors (65339991).

133840809 is a wasteful number, since it uses less digits than its factorization.

133840809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22461 (or 22455 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 133840809 is about 11568.9588554891. The cubic root of 133840809 is about 511.5202733599.

The spelling of 133840809 in words is "one hundred thirty-three million, eight hundred forty thousand, eight hundred nine".