400002208 has 12 divisors (see below), whose sum is σ = 787504410. Its totient is φ = 200001088.

The previous prime is 400002203. The next prime is 400002209. The reversal of 400002208 is 802200004.

It can be written as a sum of positive squares in only one way, i.e., 207014544 + 192987664 = 14388^2 + 13892^2 .

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 = 400002191 and 400002200.

It is not an unprimeable number, because it can be changed into a prime (400002203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250003 + ... + 6250066.

Almost surely, 2^400002208 is an apocalyptic number.

It is an amenable number.

400002208 is a deficient number, since it is larger than the sum of its proper divisors (387502202).

400002208 is a wasteful number, since it uses less digits than its factorization.

400002208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12500079 (or 12500071 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 400002208 is about 20000.0551999238. The cubic root of 400002208 is about 736.8076554492.

The spelling of 400002208 in words is "four hundred million, two thousand, two hundred eight".