218400004 has 12 divisors (see below), whose sum is σ = 383085724. Its totient is φ = 108946944.

The previous prime is 218400001. The next prime is 218400043. The reversal of 218400004 is 400004812.

It can be written as a sum of positive squares in 2 ways, for example, as 50438404 + 167961600 = 7102^2 + 12960^2 .

It is not an unprimeable number, because it can be changed into a prime (218400001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61317 + ... + 64780.

Almost surely, 2^218400004 is an apocalyptic number.

It is an amenable number.

218400004 is a deficient number, since it is larger than the sum of its proper divisors (164685720).

218400004 is a wasteful number, since it uses less digits than its factorization.

218400004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126534 (or 126532 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 218400004 is about 14778.3626968619. The cubic root of 218400004 is about 602.2140458780.

Adding to 218400004 its reverse (400004812), we get a palindrome (618404816).

The spelling of 218400004 in words is "two hundred eighteen million, four hundred thousand, four".