40423513 has 4 divisors (see below), whose sum is σ = 43533028. Its totient is φ = 37314000.

The previous prime is 40423459. The next prime is 40423517. The reversal of 40423513 is 31532404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9809424 + 30614089 = 3132^2 + 5533^2 .

It is a cyclic number.

It is not a de Polignac number, because 40423513 - 2⁹ = 40423001 is a prime.

It is a super-2 number, since 2×40423513² = 3268120806522338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40423517) 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, 1554738 + ... + 1554763.

It is an arithmetic number, because the mean of its divisors is an integer number (10883257).

Almost surely, 2^40423513 is an apocalyptic number.

It is an amenable number.

40423513 is a deficient number, since it is larger than the sum of its proper divisors (3109515).

40423513 is a wasteful number, since it uses less digits than its factorization.

40423513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109514.

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

The square root of 40423513 is about 6357.9488044494. The cubic root of 40423513 is about 343.1979494709.

Adding to 40423513 its reverse (31532404), we get a palindrome (71955917).

The spelling of 40423513 in words is "forty million, four hundred twenty-three thousand, five hundred thirteen".