218238516 has 24 divisors (see below), whose sum is σ = 565803840. Its totient is φ = 72746136.

The previous prime is 218238511. The next prime is 218238521. The reversal of 218238516 is 615832812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (218238511) and next prime (218238521).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218238511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010256 + ... + 1010471.

It is an arithmetic number, because the mean of its divisors is an integer number (23575160).

Almost surely, 2^218238516 is an apocalyptic number.

It is an amenable number.

218238516 is an abundant number, since it is smaller than the sum of its proper divisors (347565324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218238516 is a wasteful number, since it uses less digits than its factorization.

218238516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020740 (or 2020732 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 218238516 is about 14772.8980230691. The cubic root of 218238516 is about 602.0655807997.

The spelling of 218238516 in words is "two hundred eighteen million, two hundred thirty-eight thousand, five hundred sixteen".