40644113 has 4 divisors (see below), whose sum is σ = 40711680. Its totient is φ = 40576548.

The previous prime is 40644083. The next prime is 40644119. The reversal of 40644113 is 31144604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40644113 - 2⁸ = 40643857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40644119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32873 + ... + 34086.

It is an arithmetic number, because the mean of its divisors is an integer number (10177920).

Almost surely, 2^40644113 is an apocalyptic number.

It is an amenable number.

40644113 is a deficient number, since it is larger than the sum of its proper divisors (67567).

40644113 is an equidigital number, since it uses as much as digits as its factorization.

40644113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67566.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 40644113 is about 6375.2735627579. The cubic root of 40644113 is about 343.8211194777.

Adding to 40644113 its reverse (31144604), we get a palindrome (71788717).

The spelling of 40644113 in words is "forty million, six hundred forty-four thousand, one hundred thirteen".