400042020 has 48 divisors (see below), whose sum is σ = 1280135808. Its totient is φ = 91438080.

The previous prime is 400042003. The next prime is 400042021. The reversal of 400042020 is 20240004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 400041987 and 400042005.

It is not an unprimeable number, because it can be changed into a prime (400042021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475821 + ... + 476660.

It is an arithmetic number, because the mean of its divisors is an integer number (26669496).

Almost surely, 2^400042020 is an apocalyptic number.

It is an amenable number.

400042020 is an abundant number, since it is smaller than the sum of its proper divisors (880093788).

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

400042020 is a wasteful number, since it uses less digits than its factorization.

400042020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952500 (or 952498 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 400042020 is about 20001.0504724127. The cubic root of 400042020 is about 736.8320993253.

Adding to 400042020 its reverse (20240004), we get a palindrome (420282024).

It can be divided in two parts, 40004 and 2020, that added together give a palindrome (42024).

The spelling of 400042020 in words is "four hundred million, forty-two thousand, twenty".