40043513 has 4 divisors (see below), whose sum is σ = 40056420. Its totient is φ = 40030608.

The previous prime is 40043489. The next prime is 40043527. The reversal of 40043513 is 31534004.

40043513 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 25928464 + 14115049 = 5092^2 + 3757^2 .

It is a cyclic number.

It is not a de Polignac number, because 40043513 - 2⁸ = 40043257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40043533) 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, 1331 + ... + 9047.

It is an arithmetic number, because the mean of its divisors is an integer number (10014105).

Almost surely, 2^40043513 is an apocalyptic number.

It is an amenable number.

40043513 is a deficient number, since it is larger than the sum of its proper divisors (12907).

40043513 is an equidigital number, since it uses as much as digits as its factorization.

40043513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12906.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 40043513 is about 6327.9943900102. The cubic root of 40043513 is about 342.1191547009.

Adding to 40043513 its reverse (31534004), we get a palindrome (71577517).

The spelling of 40043513 in words is "forty million, forty-three thousand, five hundred thirteen".