40030405 has 4 divisors (see below), whose sum is σ = 48036492. Its totient is φ = 32024320.

The previous prime is 40030399. The next prime is 40030421. The reversal of 40030405 is 50403004.

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 27857284 + 12173121 = 5278^2 + 3489^2 .

It is not a de Polignac number, because 40030405 - 2¹¹ = 40028357 is a prime.

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, 4003036 + ... + 4003045.

It is an arithmetic number, because the mean of its divisors is an integer number (12009123).

Almost surely, 2^40030405 is an apocalyptic number.

It is an amenable number.

40030405 is a deficient number, since it is larger than the sum of its proper divisors (8006087).

40030405 is an equidigital number, since it uses as much as digits as its factorization.

40030405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8006086.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 40030405 is about 6326.9585900336. The cubic root of 40030405 is about 342.0818204200.

Adding to 40030405 its reverse (50403004), we get a palindrome (90433409).

The spelling of 40030405 in words is "forty million, thirty thousand, four hundred five".