40513243 has 4 divisors (see below), whose sum is σ = 40526920. Its totient is φ = 40499568.

The previous prime is 40513241. The next prime is 40513273. The reversal of 40513243 is 34231504.

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 is a cyclic number.

It is not a de Polignac number, because 40513243 - 2¹ = 40513241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40513241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330 + ... + 9007.

It is an arithmetic number, because the mean of its divisors is an integer number (10131730).

Almost surely, 2^40513243 is an apocalyptic number.

40513243 is a deficient number, since it is larger than the sum of its proper divisors (13677).

40513243 is an equidigital number, since it uses as much as digits as its factorization.

40513243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13676.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 40513243 is about 6365.0014139826. The cubic root of 40513243 is about 343.4516994294.

Adding to 40513243 its reverse (34231504), we get a palindrome (74744747).

The spelling of 40513243 in words is "forty million, five hundred thirteen thousand, two hundred forty-three".