400000204224 has 42 divisors (see below), whose sum is σ = 1146528364800. Its totient is φ = 133333401216.

The previous prime is 400000204171. The next prime is 400000204231. The reversal of 400000204224 is 422402000004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 400000204197 and 400000204206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 347221824 + ... + 347222975.

It is an arithmetic number, because the mean of its divisors is an integer number (27298294400).

Almost surely, 2^400000204224 is an apocalyptic number.

It is an amenable number.

400000204224 is an abundant number, since it is smaller than the sum of its proper divisors (746528160576).

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

400000204224 is a wasteful number, since it uses less digits than its factorization.

400000204224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694444817 (or 694444804 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 400000204224 its reverse (422402000004), we get a palindrome (822402204228).

The spelling of 400000204224 in words is "four hundred billion, two hundred four thousand, two hundred twenty-four".