40845209 has 8 divisors (see below), whose sum is σ = 41842560. Its totient is φ = 39853296.

The previous prime is 40845199. The next prime is 40845223. The reversal of 40845209 is 90254804.

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

It is a cyclic number.

It is not a de Polignac number, because 40845209 - 2⁸ = 40844953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40845239) 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 7 ways as a sum of consecutive naturals, for example, 16667 + ... + 18959.

It is an arithmetic number, because the mean of its divisors is an integer number (5230320).

Almost surely, 2^40845209 is an apocalyptic number.

It is an amenable number.

40845209 is a deficient number, since it is larger than the sum of its proper divisors (997351).

40845209 is a wasteful number, since it uses less digits than its factorization.

40845209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 40845209 is about 6391.0256610344. The cubic root of 40845209 is about 344.3872312611.

The spelling of 40845209 in words is "forty million, eight hundred forty-five thousand, two hundred nine".