40218686 has 4 divisors (see below), whose sum is σ = 60328032. Its totient is φ = 20109342.

The previous prime is 40218683. The next prime is 40218713. The reversal of 40218686 is 68681204.

40218686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40218683) 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 as a sum of consecutive naturals, namely, 10054670 + ... + 10054673.

It is an arithmetic number, because the mean of its divisors is an integer number (15082008).

Almost surely, 2^40218686 is an apocalyptic number.

40218686 is a deficient number, since it is larger than the sum of its proper divisors (20109346).

40218686 is a wasteful number, since it uses less digits than its factorization.

40218686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20109345.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 40218686 is about 6341.8204011151. The cubic root of 40218686 is about 342.6173033120.

It can be divided in two parts, 40218 and 686, that added together give a palindrome (40904).

The spelling of 40218686 in words is "forty million, two hundred eighteen thousand, six hundred eighty-six".