218115207 has 8 divisors (see below), whose sum is σ = 323133680. Its totient is φ = 145410120.

The previous prime is 218115197. The next prime is 218115223. The reversal of 218115207 is 702511812.

It is not a de Polignac number, because 218115207 - 2⁶ = 218115143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8078341 = 218115207 / (2 + 1 + 8 + 1 + 1 + 5 + 2 + 0 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218115277) 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, 4039144 + ... + 4039197.

It is an arithmetic number, because the mean of its divisors is an integer number (40391710).

Almost surely, 2^218115207 is an apocalyptic number.

218115207 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

218115207 is a deficient number, since it is larger than the sum of its proper divisors (105018473).

218115207 is an equidigital number, since it uses as much as digits as its factorization.

218115207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8078350 (or 8078344 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 218115207 is about 14768.7239462318. The cubic root of 218115207 is about 601.9521665213.

The spelling of 218115207 in words is "two hundred eighteen million, one hundred fifteen thousand, two hundred seven".