218138005 has 8 divisors (see below), whose sum is σ = 262215072. Its totient is φ = 174210768.

The previous prime is 218137987. The next prime is 218138023. The reversal of 218138005 is 500831812.

It is an interprime number because it is at equal distance from previous prime (218137987) and next prime (218138023).

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 218138005 - 2¹⁷ = 218006933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34227 + ... + 40096.

It is an arithmetic number, because the mean of its divisors is an integer number (32776884).

Almost surely, 2^218138005 is an apocalyptic number.

It is an amenable number.

218138005 is a deficient number, since it is larger than the sum of its proper divisors (44077067).

218138005 is an equidigital number, since it uses as much as digits as its factorization.

218138005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74915.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 218138005 is about 14769.4957598423. The cubic root of 218138005 is about 601.9731383547.

Adding to 218138005 its reverse (500831812), we get a palindrome (718969817).

It can be divided in two parts, 2181 and 38005, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 218138005 in words is "two hundred eighteen million, one hundred thirty-eight thousand, five".