33640009 has 4 divisors (see below), whose sum is σ = 36227716. Its totient is φ = 31052304.

The previous prime is 33640003. The next prime is 33640021. The reversal of 33640009 is 90004633.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90004633 = 43 ⋅2093131.

It can be written as a sum of positive squares in 2 ways, for example, as 4963984 + 28676025 = 2228^2 + 5355^2 .

It is a cyclic number.

It is not a de Polignac number, because 33640009 - 2⁹ = 33639497 is a prime.

It is a super-2 number, since 2×33640009² = 2263300411040162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33640003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1293834 + ... + 1293859.

It is an arithmetic number, because the mean of its divisors is an integer number (9056929).

Almost surely, 2^33640009 is an apocalyptic number.

It is an amenable number.

33640009 is a deficient number, since it is larger than the sum of its proper divisors (2587707).

33640009 is a wasteful number, since it uses less digits than its factorization.

33640009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587706.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 33640009 is about 5800.0007758620. Note that the first 3 decimals coincide. The cubic root of 33640009 is about 322.8137571060.

The spelling of 33640009 in words is "thirty-three million, six hundred forty thousand, nine".