40404400040 has 16 divisors (see below), whose sum is σ = 90909900180. Its totient is φ = 16161760000.

The previous prime is 40404400009. The next prime is 40404400051. The reversal of 40404400040 is 4000440404.

It can be written as a sum of positive squares in 2 ways, for example, as 35472708964 + 4931691076 = 188342^2 + 70226^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 40404399985 and 40404400021.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505054961 + ... + 505055040.

Almost surely, 2^40404400040 is an apocalyptic number.

40404400040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40404400040 is an abundant number, since it is smaller than the sum of its proper divisors (50505500140).

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

40404400040 is a wasteful number, since it uses less digits than its factorization.

40404400040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010110012 (or 1010110008 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 40404400040 its reverse (4000440404), we get a palindrome (44404840444).

The spelling of 40404400040 in words is "forty billion, four hundred four million, four hundred thousand, forty".