133509378 has 16 divisors (see below), whose sum is σ = 267353856. Its totient is φ = 44447280.

The previous prime is 133509373. The next prime is 133509427. The reversal of 133509378 is 873905331.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133509373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8626 + ... + 18477.

It is an arithmetic number, because the mean of its divisors is an integer number (16709616).

Almost surely, 2^133509378 is an apocalyptic number.

133509378 is an abundant number, since it is smaller than the sum of its proper divisors (133844478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133509378 is a wasteful number, since it uses less digits than its factorization.

133509378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27929.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 133509378 is about 11554.6258269145. The cubic root of 133509378 is about 511.0976971940.

The spelling of 133509378 in words is "one hundred thirty-three million, five hundred nine thousand, three hundred seventy-eight".