40020040424 has 128 divisors (see below), whose sum is σ = 93521433600. Its totient is φ = 15632870400.

The previous prime is 40020040421. The next prime is 40020040429. The reversal of 40020040424 is 42404002004.

It is a junction number, because it is equal to n+sod(n) for n = 40020040396 and 40020040405.

It is not an unprimeable number, because it can be changed into a prime (40020040421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52866254 + ... + 52867010.

It is an arithmetic number, because the mean of its divisors is an integer number (730636200).

Almost surely, 2^40020040424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40020040424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46760716800).

40020040424 is an abundant number, since it is smaller than the sum of its proper divisors (53501393176).

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

40020040424 is a wasteful number, since it uses less digits than its factorization.

40020040424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603 (or 1599 counting only the distinct ones).

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

Adding to 40020040424 its reverse (42404002004), we get a palindrome (82424042428).

The spelling of 40020040424 in words is "forty billion, twenty million, forty thousand, four hundred twenty-four".