40405205 has 4 divisors (see below), whose sum is σ = 48486252. Its totient is φ = 32324160.

The previous prime is 40405187. The next prime is 40405217. The reversal of 40405205 is 50250404.

It is a happy number.

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 27394756 + 13010449 = 5234^2 + 3607^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40405205 is a prime.

It is a super-3 number, since 3×40405205³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 4040516 + ... + 4040525.

It is an arithmetic number, because the mean of its divisors is an integer number (12121563).

Almost surely, 2^40405205 is an apocalyptic number.

It is an amenable number.

40405205 is a deficient number, since it is larger than the sum of its proper divisors (8081047).

40405205 is an equidigital number, since it uses as much as digits as its factorization.

40405205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8081046.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 40405205 is about 6356.5088688682. The cubic root of 40405205 is about 343.1461296561.

Adding to 40405205 its reverse (50250404), we get a palindrome (90655609).

The spelling of 40405205 in words is "forty million, four hundred five thousand, two hundred five".