400040224 has 12 divisors (see below), whose sum is σ = 787579254. Its totient is φ = 200020096.

The previous prime is 400040191. The next prime is 400040273. The reversal of 400040224 is 422040004.

It can be written as a sum of positive squares in only one way, i.e., 397284624 + 2755600 = 19932^2 + 1660^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 400040198 and 400040207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250597 + ... + 6250660.

Almost surely, 2^400040224 is an apocalyptic number.

It is an amenable number.

400040224 is a deficient number, since it is larger than the sum of its proper divisors (387539030).

400040224 is a wasteful number, since it uses less digits than its factorization.

400040224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12501267 (or 12501259 counting only the distinct ones).

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

The square root of 400040224 is about 20001.0055747205. The cubic root of 400040224 is about 736.8309966474.

Adding to 400040224 its reverse (422040004), we get a palindrome (822080228).

The spelling of 400040224 in words is "four hundred million, forty thousand, two hundred twenty-four".