218440004 has 12 divisors (see below), whose sum is σ = 404756604. Its totient is φ = 102795264.

The previous prime is 218439983. The next prime is 218440037. The reversal of 218440004 is 400044812.

It can be written as a sum of positive squares in 2 ways, for example, as 203632900 + 14807104 = 14270^2 + 3848^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606109 + ... + 1606244.

It is an arithmetic number, because the mean of its divisors is an integer number (33729717).

Almost surely, 2^218440004 is an apocalyptic number.

It is an amenable number.

218440004 is a deficient number, since it is larger than the sum of its proper divisors (186316600).

218440004 is a wasteful number, since it uses less digits than its factorization.

218440004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3212374 (or 3212372 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 218440004 is about 14779.7159647945. The cubic root of 218440004 is about 602.2508088373.

Adding to 218440004 its reverse (400044812), we get a palindrome (618484816).

The spelling of 218440004 in words is "two hundred eighteen million, four hundred forty thousand, four".