400222044 has 72 divisors (see below), whose sum is σ = 1048603920. Its totient is φ = 128604672.

The previous prime is 400222019. The next prime is 400222063. The reversal of 400222044 is 440222004.

400222044 is a `hidden beast` number, since 400 + 2 + 220 + 44 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 149187 + ... + 151845.

Almost surely, 2^400222044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400222044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (524301960).

400222044 is an abundant number, since it is smaller than the sum of its proper divisors (648381876).

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

400222044 is a wasteful number, since it uses less digits than its factorization.

400222044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819 (or 2814 counting only the distinct ones).

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

The square root of 400222044 is about 20005.5503298460. The cubic root of 400222044 is about 736.9426106903.

Adding to 400222044 its reverse (440222004), we get a palindrome (840444048).

The spelling of 400222044 in words is "four hundred million, two hundred twenty-two thousand, forty-four".