40342405 has 4 divisors (see below), whose sum is σ = 48410892. Its totient is φ = 32273920.

The previous prime is 40342373. The next prime is 40342409. The reversal of 40342405 is 50424304.

It is a happy number.

40342405 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.

It can be written as a sum of positive squares in 2 ways, for example, as 5461569 + 34880836 = 2337^2 + 5906^2 .

It is not a de Polignac number, because 40342405 - 2⁵ = 40342373 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 (40342409) 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, 4034236 + ... + 4034245.

It is an arithmetic number, because the mean of its divisors is an integer number (12102723).

Almost surely, 2^40342405 is an apocalyptic number.

It is an amenable number.

40342405 is a deficient number, since it is larger than the sum of its proper divisors (8068487).

40342405 is an equidigital number, since it uses as much as digits as its factorization.

40342405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8068486.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 40342405 is about 6351.5671294571. The cubic root of 40342405 is about 342.9682585864.

Adding to 40342405 its reverse (50424304), we get a palindrome (90766709).

The spelling of 40342405 in words is "forty million, three hundred forty-two thousand, four hundred five".