400044220 has 24 divisors (see below), whose sum is σ = 841234464. Its totient is φ = 159800256.

The previous prime is 400044193. The next prime is 400044223. The reversal of 400044220 is 22440004.

It is a junction number, because it is equal to n+sod(n) for n = 400044194 and 400044203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400044223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1929 + ... + 28351.

It is an arithmetic number, because the mean of its divisors is an integer number (35051436).

Almost surely, 2^400044220 is an apocalyptic number.

It is an amenable number.

400044220 is an abundant number, since it is smaller than the sum of its proper divisors (441190244).

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

400044220 is a wasteful number, since it uses less digits than its factorization.

400044220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27189 (or 27187 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 400044220 is about 20001.1054694484. The cubic root of 400044220 is about 736.8334500398.

Adding to 400044220 its reverse (22440004), we get a palindrome (422484224).

The spelling of 400044220 in words is "four hundred million, forty-four thousand, two hundred twenty".