40644513 has 24 divisors (see below), whose sum is σ = 72258368. Its totient is φ = 21438432.

The previous prime is 40644509. The next prime is 40644517. The reversal of 40644513 is 31544604.

40644513 is a `hidden beast` number, since 4 + 0 + 644 + 5 + 13 = 666.

40644513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40644509) and next prime (40644517).

It is not a de Polignac number, because 40644513 - 2² = 40644509 is a prime.

It is a super-3 number, since 3×40644513³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (40644517) 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 23 ways as a sum of consecutive naturals, for example, 23995 + ... + 25632.

Almost surely, 2^40644513 is an apocalyptic number.

It is an amenable number.

40644513 is a deficient number, since it is larger than the sum of its proper divisors (31613855).

40644513 is a wasteful number, since it uses less digits than its factorization.

40644513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49653 (or 49650 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 40644513 is about 6375.3049338836. The cubic root of 40644513 is about 343.8222473819.

Subtracting from 40644513 its reverse (31544604), we obtain a palindrome (9099909).

The spelling of 40644513 in words is "forty million, six hundred forty-four thousand, five hundred thirteen".