33840643 has 2 divisors, whose sum is σ = 33840644. Its totient is φ = 33840642.

The previous prime is 33840641. The next prime is 33840647. The reversal of 33840643 is 34604833.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 33840643 - 2¹ = 33840641 is a prime.

It is a super-2 number, since 2×33840643² = 2290378237306898, which contains 22 as substring.

Together with 33840641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (33840641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16920321 + 16920322.

It is an arithmetic number, because the mean of its divisors is an integer number (16920322).

Almost surely, 2^33840643 is an apocalyptic number.

33840643 is a deficient number, since it is larger than the sum of its proper divisors (1).

33840643 is an equidigital number, since it uses as much as digits as its factorization.

33840643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 33840643 is about 5817.2710956255. The cubic root of 33840643 is about 323.4542551458.

The spelling of 33840643 in words is "thirty-three million, eight hundred forty thousand, six hundred forty-three".