218378245 has 8 divisors (see below), whose sum is σ = 262133784. Its totient is φ = 174649344.

The previous prime is 218378239. The next prime is 218378257. The reversal of 218378245 is 542873812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49196196 + 169182049 = 7014^2 + 13007^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218378245 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218378198 and 218378207.

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, 25557 + ... + 33013.

It is an arithmetic number, because the mean of its divisors is an integer number (32766723).

Almost surely, 2^218378245 is an apocalyptic number.

It is an amenable number.

218378245 is a deficient number, since it is larger than the sum of its proper divisors (43755539).

218378245 is an equidigital number, since it uses as much as digits as its factorization.

218378245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13319.

The product of its digits is 107520, while the sum is 40.

The square root of 218378245 is about 14777.6265008965. The cubic root of 218378245 is about 602.1940458622.

The spelling of 218378245 in words is "two hundred eighteen million, three hundred seventy-eight thousand, two hundred forty-five".