40644613 has 8 divisors (see below), whose sum is σ = 41598720. Its totient is φ = 39694320.

The previous prime is 40644601. The next prime is 40644619. The reversal of 40644613 is 31644604.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40644613 - 2¹⁷ = 40513541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42723 + ... + 43663.

It is an arithmetic number, because the mean of its divisors is an integer number (5199840).

Almost surely, 2^40644613 is an apocalyptic number.

It is an amenable number.

40644613 is a deficient number, since it is larger than the sum of its proper divisors (954107).

40644613 is an equidigital number, since it uses as much as digits as its factorization.

40644613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 40644613 is about 6375.3127766408. The cubic root of 40644613 is about 343.8225293568.

Subtracting from 40644613 its reverse (31644604), we obtain a palindrome (9000009).

The spelling of 40644613 in words is "forty million, six hundred forty-four thousand, six hundred thirteen".