40447218 has 32 divisors (see below), whose sum is σ = 92695680. Its totient is φ = 11525760.

The previous prime is 40447201. The next prime is 40447247. The reversal of 40447218 is 81274404.

40447218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18318 + ... + 20406.

It is an arithmetic number, because the mean of its divisors is an integer number (2896740).

Almost surely, 2^40447218 is an apocalyptic number.

40447218 is an abundant number, since it is smaller than the sum of its proper divisors (52248462).

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

40447218 is a wasteful number, since it uses less digits than its factorization.

40447218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562.

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 40447218 is about 6359.8127330921. The cubic root of 40447218 is about 343.2650219661.

The spelling of 40447218 in words is "forty million, four hundred forty-seven thousand, two hundred eighteen".