40636243 has 4 divisors (see below), whose sum is σ = 41092920. Its totient is φ = 40179568.

The previous prime is 40636229. The next prime is 40636259. The reversal of 40636243 is 34263604.

40636243 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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40636243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40636283) 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 3 ways as a sum of consecutive naturals, for example, 228205 + ... + 228382.

It is an arithmetic number, because the mean of its divisors is an integer number (10273230).

Almost surely, 2^40636243 is an apocalyptic number.

40636243 is a deficient number, since it is larger than the sum of its proper divisors (456677).

40636243 is an equidigital number, since it uses as much as digits as its factorization.

40636243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456676.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 40636243 is about 6374.6563044607. The cubic root of 40636243 is about 343.7989264574.

Adding to 40636243 its reverse (34263604), we get a palindrome (74899847).

The spelling of 40636243 in words is "forty million, six hundred thirty-six thousand, two hundred forty-three".