40020305 has 16 divisors (see below), whose sum is σ = 52983504. Its totient is φ = 28830720.

The previous prime is 40020271. The next prime is 40020307. The reversal of 40020305 is 50302004.

It can be written as a sum of positive squares in 8 ways, for example, as 13897984 + 26122321 = 3728^2 + 5111^2 .

It is not a de Polignac number, because 40020305 - 2¹⁸ = 39758161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40020305.

It is not an unprimeable number, because it can be changed into a prime (40020307) 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 15 ways as a sum of consecutive naturals, for example, 4844 + ... + 10173.

It is an arithmetic number, because the mean of its divisors is an integer number (3311469).

Almost surely, 2^40020305 is an apocalyptic number.

It is an amenable number.

40020305 is a deficient number, since it is larger than the sum of its proper divisors (12963199).

40020305 is a wasteful number, since it uses less digits than its factorization.

40020305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15076.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 40020305 is about 6326.1603678693. The cubic root of 40020305 is about 342.0530479823.

Adding to 40020305 its reverse (50302004), we get a palindrome (90322309).

The spelling of 40020305 in words is "forty million, twenty thousand, three hundred five".