218340245 has 4 divisors (see below), whose sum is σ = 262008300. Its totient is φ = 174672192.

The previous prime is 218340193. The next prime is 218340251. The reversal of 218340245 is 542043812.

It is a happy number.

218340245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74891716 + 143448529 = 8654^2 + 11977^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218340245 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21834020 + ... + 21834029.

It is an arithmetic number, because the mean of its divisors is an integer number (65502075).

Almost surely, 2^218340245 is an apocalyptic number.

It is an amenable number.

218340245 is a deficient number, since it is larger than the sum of its proper divisors (43668055).

218340245 is an equidigital number, since it uses as much as digits as its factorization.

218340245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43668054.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 218340245 is about 14776.3407175119. The cubic root of 218340245 is about 602.1591145726.

The spelling of 218340245 in words is "two hundred eighteen million, three hundred forty thousand, two hundred forty-five".