40402020405 has 8 divisors (see below), whose sum is σ = 64643232672. Its totient is φ = 21547744208.

The previous prime is 40402020403. The next prime is 40402020427. The reversal of 40402020405 is 50402020404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40402020405 - 2¹ = 40402020403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40402020403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1346733999 + ... + 1346734028.

It is an arithmetic number, because the mean of its divisors is an integer number (8080404084).

Almost surely, 2^40402020405 is an apocalyptic number.

It is an amenable number.

40402020405 is a deficient number, since it is larger than the sum of its proper divisors (24241212267).

40402020405 is a wasteful number, since it uses less digits than its factorization.

40402020405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693468035.

The product of its (nonzero) digits is 1280, while the sum is 21.

Adding to 40402020405 its reverse (50402020404), we get a palindrome (90804040809).

Subtracting 40402020405 from its reverse (50402020404), we obtain a palindrome (9999999999).

The spelling of 40402020405 in words is "forty billion, four hundred two million, twenty thousand, four hundred five".