40020004040 has 32 divisors (see below), whose sum is σ = 91521162360. Its totient is φ = 15745574400.

The previous prime is 40020004033. The next prime is 40020004043. The reversal of 40020004040 is 4040002004.

It can be written as a sum of positive squares in 4 ways, for example, as 7879402756 + 32140601284 = 88766^2 + 179278^2 .

It is not an unprimeable number, because it can be changed into a prime (40020004043) 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, 8198381 + ... + 8203260.

Almost surely, 2^40020004040 is an apocalyptic number.

40020004040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40020004040 is an abundant number, since it is smaller than the sum of its proper divisors (51501158320).

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

40020004040 is a wasteful number, since it uses less digits than its factorization.

40020004040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16401713 (or 16401709 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 40020004040 its reverse (4040002004), we get a palindrome (44060006044).

The spelling of 40020004040 in words is "forty billion, twenty million, four thousand, forty".