33640243 has 8 divisors (see below), whose sum is σ = 41403488. Its totient is φ = 26616384.

The previous prime is 33640223. The next prime is 33640259. The reversal of 33640243 is 34204633.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33640243 is a prime.

It is a super-2 number, since 2×33640243² = 2263331898198098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33640223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184746 + ... + 184927.

It is an arithmetic number, because the mean of its divisors is an integer number (5175436).

Almost surely, 2^33640243 is an apocalyptic number.

33640243 is a deficient number, since it is larger than the sum of its proper divisors (7763245).

33640243 is a wasteful number, since it uses less digits than its factorization.

33640243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369693.

The product of its (nonzero) digits is 5184, while the sum is 25.

The square root of 33640243 is about 5800.0209482380. The cubic root of 33640243 is about 322.8145056020.

Adding to 33640243 its reverse (34204633), we get a palindrome (67844876).

The spelling of 33640243 in words is "thirty-three million, six hundred forty thousand, two hundred forty-three".