218463806 has 24 divisors (see below), whose sum is σ = 361605720. Its totient is φ = 98912880.

The previous prime is 218463803. The next prime is 218463811. The reversal of 218463806 is 608364812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 218463806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218463803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65405 + ... + 68663.

It is an arithmetic number, because the mean of its divisors is an integer number (15066905).

Almost surely, 2^218463806 is an apocalyptic number.

218463806 is a deficient number, since it is larger than the sum of its proper divisors (143141914).

218463806 is a wasteful number, since it uses less digits than its factorization.

218463806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560 (or 3549 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 218463806 is about 14780.5211680779. The cubic root of 218463806 is about 602.2726825065.

It can be divided in two parts, 21846 and 3806, that added together give a palindrome (25652).

The spelling of 218463806 in words is "two hundred eighteen million, four hundred sixty-three thousand, eight hundred six".