400218668 has 12 divisors (see below), whose sum is σ = 701617560. Its totient is φ = 199756512.

The previous prime is 400218667. The next prime is 400218683. The reversal of 400218668 is 866812004.

It is not an unprimeable number, because it can be changed into a prime (400218667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85646 + ... + 90197.

It is an arithmetic number, because the mean of its divisors is an integer number (58468130).

Almost surely, 2^400218668 is an apocalyptic number.

It is an amenable number.

400218668 is a deficient number, since it is larger than the sum of its proper divisors (301398892).

400218668 is a wasteful number, since it uses less digits than its factorization.

400218668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176416 (or 176414 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 400218668 is about 20005.4659530839. The cubic root of 400218668 is about 736.9405385696.

The spelling of 400218668 in words is "four hundred million, two hundred eighteen thousand, six hundred sixty-eight".