218238515 has 8 divisors (see below), whose sum is σ = 285694128. Its totient is φ = 158718880.

The previous prime is 218238511. The next prime is 218238521. The reversal of 218238515 is 515832812.

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

It is not a de Polignac number, because 218238515 - 2² = 218238511 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1983932 + ... + 1984041.

It is an arithmetic number, because the mean of its divisors is an integer number (35711766).

Almost surely, 2^218238515 is an apocalyptic number.

218238515 is a deficient number, since it is larger than the sum of its proper divisors (67455613).

218238515 is a wasteful number, since it uses less digits than its factorization.

218238515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967989.

The product of its digits is 19200, while the sum is 35.

The square root of 218238515 is about 14772.8979892234. The cubic root of 218238515 is about 602.0655798801.

The spelling of 218238515 in words is "two hundred eighteen million, two hundred thirty-eight thousand, five hundred fifteen".