40405340020 has 24 divisors (see below), whose sum is σ = 84884583168. Its totient is φ = 16155780000.

The previous prime is 40405339991. The next prime is 40405340021. The reversal of 40405340020 is 2004350404.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 40405339973 and 40405340000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40405340021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344956 + ... + 446995.

It is an arithmetic number, because the mean of its divisors is an integer number (3536857632).

Almost surely, 2^40405340020 is an apocalyptic number.

It is an amenable number.

40405340020 is an abundant number, since it is smaller than the sum of its proper divisors (44479243148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40405340020 is a wasteful number, since it uses less digits than its factorization.

40405340020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794511 (or 794509 counting only the distinct ones).

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

Adding to 40405340020 its reverse (2004350404), we get a palindrome (42409690424).

The spelling of 40405340020 in words is "forty billion, four hundred five million, three hundred forty thousand, twenty".