40000218 has 16 divisors (see below), whose sum is σ = 84706560. Its totient is φ = 12549056.

The previous prime is 40000217. The next prime is 40000223. The reversal of 40000218 is 81200004.

40000218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 40000197 and 40000206.

It is not an unprimeable number, because it can be changed into a prime (40000211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195978 + ... + 196181.

It is an arithmetic number, because the mean of its divisors is an integer number (5294160).

Almost surely, 2^40000218 is an apocalyptic number.

40000218 is an abundant number, since it is smaller than the sum of its proper divisors (44706342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40000218 is a wasteful number, since it uses less digits than its factorization.

40000218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392181.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 40000218 is about 6324.5725547265. The cubic root of 40000218 is about 341.9958106255.

The spelling of 40000218 in words is "forty million, two hundred eighteen", and thus it is an aban number.