33405409 has 4 divisors (see below), whose sum is σ = 33417216. Its totient is φ = 33393604.

The previous prime is 33405403. The next prime is 33405451. The reversal of 33405409 is 90450433.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 33405409 - 2⁵ = 33405377 is a prime.

It is a super-2 number, since 2×33405409² = 2231842700914562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33405403) 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, 1152 + ... + 8254.

It is an arithmetic number, because the mean of its divisors is an integer number (8354304).

Almost surely, 2^33405409 is an apocalyptic number.

It is an amenable number.

33405409 is a deficient number, since it is larger than the sum of its proper divisors (11807).

33405409 is an equidigital number, since it uses as much as digits as its factorization.

33405409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11806.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 33405409 is about 5779.7412571844. The cubic root of 33405409 is about 322.0615888519.

The spelling of 33405409 in words is "thirty-three million, four hundred five thousand, four hundred nine".