33540809 has 4 divisors (see below), whose sum is σ = 33593616. Its totient is φ = 33488004.

The previous prime is 33540797. The next prime is 33540811. The reversal of 33540809 is 90804533.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90804533 = 3373 ⋅26921.

It is a cyclic number.

It is not a de Polignac number, because 33540809 - 2⁸ = 33540553 is a prime.

It is a super-2 number, since 2×33540809² = 2249971736748962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33540889) 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 3 ways as a sum of consecutive naturals, for example, 25439 + ... + 26724.

It is an arithmetic number, because the mean of its divisors is an integer number (8398404).

Almost surely, 2^33540809 is an apocalyptic number.

It is an amenable number.

33540809 is a deficient number, since it is larger than the sum of its proper divisors (52807).

33540809 is an equidigital number, since it uses as much as digits as its factorization.

33540809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52806.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 33540809 is about 5791.4427390763. The cubic root of 33540809 is about 322.4961327982.

The spelling of 33540809 in words is "thirty-three million, five hundred forty thousand, eight hundred nine".