400418218 has 32 divisors (see below), whose sum is σ = 635539968. Its totient is φ = 188956800.

The previous prime is 400418171. The next prime is 400418251. The reversal of 400418218 is 812814004.

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 15 ways as a sum of consecutive naturals, for example, 821971 + ... + 822457.

It is an arithmetic number, because the mean of its divisors is an integer number (19860624).

Almost surely, 2^400418218 is an apocalyptic number.

400418218 is a deficient number, since it is larger than the sum of its proper divisors (235121750).

400418218 is a wasteful number, since it uses less digits than its factorization.

400418218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 400418218 is about 20010.4527185169. The cubic root of 400418218 is about 737.0629983331.

It can be divided in two parts, 4004 and 18218, that added together give a palindrome (22222).

The spelling of 400418218 in words is "four hundred million, four hundred eighteen thousand, two hundred eighteen".