400004022 has 16 divisors (see below), whose sum is σ = 872736192. Its totient is φ = 121213320.

The previous prime is 400004021. The next prime is 400004029. The reversal of 400004022 is 220400004.

It is a junction number, because it is equal to n+sod(n) for n = 400003989 and 400004007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400004021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3030268 + ... + 3030399.

It is an arithmetic number, because the mean of its divisors is an integer number (54546012).

Almost surely, 2^400004022 is an apocalyptic number.

400004022 is an abundant number, since it is smaller than the sum of its proper divisors (472732170).

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

400004022 is a wasteful number, since it uses less digits than its factorization.

400004022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060683.

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

The square root of 400004022 is about 20000.1005497472. The cubic root of 400004022 is about 736.8087692489.

Adding to 400004022 its reverse (220400004), we get a palindrome (620404026).

The spelling of 400004022 in words is "four hundred million, four thousand, twenty-two".