40042440020 has 48 divisors (see below), whose sum is σ = 92679346368. Its totient is φ = 14410767360.

The previous prime is 40042440007. The next prime is 40042440029. The reversal of 40042440020 is 2004424004.

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 = 40042439974 and 40042440001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042440029) 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 15 ways as a sum of consecutive naturals, for example, 916862 + ... + 959541.

It is an arithmetic number, because the mean of its divisors is an integer number (1930819716).

Almost surely, 2^40042440020 is an apocalyptic number.

It is an amenable number.

40042440020 is an abundant number, since it is smaller than the sum of its proper divisors (52636906348).

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

40042440020 is a wasteful number, since it uses less digits than its factorization.

40042440020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876520 (or 1876518 counting only the distinct ones).

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

Adding to 40042440020 its reverse (2004424004), we get a palindrome (42046864024).

The spelling of 40042440020 in words is "forty billion, forty-two million, four hundred forty thousand, twenty".