40040424020 has 72 divisors (see below), whose sum is σ = 89489569176. Its totient is φ = 15045769216.

The previous prime is 40040424019. The next prime is 40040424029. The reversal of 40040424020 is 2042404004.

It can be written as a sum of positive squares in 12 ways, for example, as 16932775876 + 23107648144 = 130126^2 + 152012^2 .

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 = 40040423983 and 40040424001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040424029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3213242 + ... + 3225678.

It is an arithmetic number, because the mean of its divisors is an integer number (1242910683).

Almost surely, 2^40040424020 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 40040424020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44744784588).

40040424020 is an abundant number, since it is smaller than the sum of its proper divisors (49449145156).

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

40040424020 is a wasteful number, since it uses less digits than its factorization.

40040424020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13037 (or 13018 counting only the distinct ones).

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

Adding to 40040424020 its reverse (2042404004), we get a palindrome (42082828024).

It can be divided in two parts, 400404 and 24020, that added together give a palindrome (424424).

The spelling of 40040424020 in words is "forty billion, forty million, four hundred twenty-four thousand, twenty".