400140042104020 has 12 divisors (see below), whose sum is σ = 840294088418484. Its totient is φ = 160056016841600.

The previous prime is 400140042103969. The next prime is 400140042104021. The reversal of 400140042104020 is 20401240041004.

It can be written as a sum of positive squares in 2 ways, for example, as 134861490288144 + 265278551815876 = 11612988^2 + 16287374^2 .

It is a super-2 number, since 2×400140042104020² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400140042103982 and 400140042104000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400140042104021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10003501052581 + ... + 10003501052620.

It is an arithmetic number, because the mean of its divisors is an integer number (70024507368207).

Almost surely, 2^{400140042104020} is an apocalyptic number.

It is an amenable number.

400140042104020 is an abundant number, since it is smaller than the sum of its proper divisors (440154046314464).

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

400140042104020 is a wasteful number, since it uses less digits than its factorization.

400140042104020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20007002105210 (or 20007002105208 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 400140042104020 its reverse (20401240041004), we get a palindrome (420541282145024).

The spelling of 400140042104020 in words is "four hundred trillion, one hundred forty billion, forty-two million, one hundred four thousand, twenty".