133394809 has 8 divisors (see below), whose sum is σ = 138620160. Its totient is φ = 128211216.

The previous prime is 133394803. The next prime is 133394813. The reversal of 133394809 is 908493331.

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

It is a cyclic number.

It is not a de Polignac number, because 133394809 - 2⁵ = 133394777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133394803) 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, 3847 + ... + 16780.

It is an arithmetic number, because the mean of its divisors is an integer number (17327520).

Almost surely, 2^133394809 is an apocalyptic number.

It is an amenable number.

133394809 is a deficient number, since it is larger than the sum of its proper divisors (5225351).

133394809 is a wasteful number, since it uses less digits than its factorization.

133394809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20879.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 133394809 is about 11549.6670514782. The cubic root of 133394809 is about 510.9514585038.

The spelling of 133394809 in words is "one hundred thirty-three million, three hundred ninety-four thousand, eight hundred nine".