133905287 has 16 divisors (see below), whose sum is σ = 142769088. Its totient is φ = 125326080.

The previous prime is 133905263. The next prime is 133905313. The reversal of 133905287 is 782509331.

It is not a de Polignac number, because 133905287 - 2¹⁰ = 133904263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133905287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133905227) 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, 290237 + ... + 290697.

It is an arithmetic number, because the mean of its divisors is an integer number (8923068).

Almost surely, 2^133905287 is an apocalyptic number.

133905287 is a deficient number, since it is larger than the sum of its proper divisors (8863801).

133905287 is a wasteful number, since it uses less digits than its factorization.

133905287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 133905287 is about 11571.7452011354. The cubic root of 133905287 is about 511.6024020457.

The spelling of 133905287 in words is "one hundred thirty-three million, nine hundred five thousand, two hundred eighty-seven".