40218443 has 4 divisors (see below), whose sum is σ = 40459440. Its totient is φ = 39977448.

The previous prime is 40218433. The next prime is 40218449. The reversal of 40218443 is 34481204.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40218443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40218449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120248 + ... + 120581.

It is an arithmetic number, because the mean of its divisors is an integer number (10114860).

Almost surely, 2^40218443 is an apocalyptic number.

40218443 is a deficient number, since it is larger than the sum of its proper divisors (240997).

40218443 is a wasteful number, since it uses less digits than its factorization.

40218443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240996.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 40218443 is about 6341.8012425493. The cubic root of 40218443 is about 342.6166132830.

Adding to 40218443 its reverse (34481204), we get a palindrome (74699647).

The spelling of 40218443 in words is "forty million, two hundred eighteen thousand, four hundred forty-three".