133540423 has 16 divisors (see below), whose sum is σ = 144702720. Its totient is φ = 122774400.

The previous prime is 133540411. The next prime is 133540439. The reversal of 133540423 is 324045331.

It is a cyclic number.

It is not a de Polignac number, because 133540423 - 2²¹ = 131443271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133540523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211318 + ... + 211948.

It is an arithmetic number, because the mean of its divisors is an integer number (9043920).

Almost surely, 2^133540423 is an apocalyptic number.

133540423 is a deficient number, since it is larger than the sum of its proper divisors (11162297).

133540423 is a wasteful number, since it uses less digits than its factorization.

133540423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 133540423 is about 11555.9691501838. The cubic root of 133540423 is about 511.1373093884.

Adding to 133540423 its reverse (324045331), we get a palindrome (457585754).

The spelling of 133540423 in words is "one hundred thirty-three million, five hundred forty thousand, four hundred twenty-three".