218412407 has 2 divisors, whose sum is σ = 218412408. Its totient is φ = 218412406.

The previous prime is 218412377. The next prime is 218412433. The reversal of 218412407 is 704214812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218412407 - 2²⁶ = 151303543 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218412407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218412457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109206203 + 109206204.

It is an arithmetic number, because the mean of its divisors is an integer number (109206204).

Almost surely, 2^218412407 is an apocalyptic number.

218412407 is a deficient number, since it is larger than the sum of its proper divisors (1).

218412407 is an equidigital number, since it uses as much as digits as its factorization.

218412407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 218412407 is about 14778.7823246707. The cubic root of 218412407 is about 602.2254456327.

The spelling of 218412407 in words is "two hundred eighteen million, four hundred twelve thousand, four hundred seven".