218929813 has 8 divisors (see below), whose sum is σ = 224647808. Its totient is φ = 213240384.

The previous prime is 218929783. The next prime is 218929853. The reversal of 218929813 is 318929812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218929813 - 2¹³ = 218921621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218929813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218929853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8845 + ... + 22717.

It is an arithmetic number, because the mean of its divisors is an integer number (28080976).

Almost surely, 2^218929813 is an apocalyptic number.

It is an amenable number.

218929813 is a deficient number, since it is larger than the sum of its proper divisors (5717995).

218929813 is a wasteful number, since it uses less digits than its factorization.

218929813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14283.

The product of its digits is 62208, while the sum is 43.

The square root of 218929813 is about 14796.2769979478. The cubic root of 218929813 is about 602.7006160324.

Subtracting 218929813 from its reverse (318929812), we obtain a palindrome (99999999).

The spelling of 218929813 in words is "two hundred eighteen million, nine hundred twenty-nine thousand, eight hundred thirteen".