42040240420 has 24 divisors (see below), whose sum is σ = 92122962624. Its totient is φ = 16084961376.

The previous prime is 42040240393. The next prime is 42040240421. The reversal of 42040240420 is 2404204024.

It is a junction number, because it is equal to n+sod(n) for n = 42040240391 and 42040240400.

It is not an unprimeable number, because it can be changed into a prime (42040240421) 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, 45695454 + ... + 45696373.

It is an arithmetic number, because the mean of its divisors is an integer number (3838456776).

Almost surely, 2^42040240420 is an apocalyptic number.

It is an amenable number.

42040240420 is an abundant number, since it is smaller than the sum of its proper divisors (50082722204).

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

42040240420 is a wasteful number, since it uses less digits than its factorization.

42040240420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91391859 (or 91391857 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 42040240420 its reverse (2404204024), we get a palindrome (44444444444).

The spelling of 42040240420 in words is "forty-two billion, forty million, two hundred forty thousand, four hundred twenty".