2218429 has 2 divisors, whose sum is σ = 2218430. Its totient is φ = 2218428.

The previous prime is 2218427. The next prime is 2218439. The reversal of 2218429 is 9248122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1435204 + 783225 = 1198^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218429 - 2¹ = 2218427 is a prime.

Together with 2218427, it forms a pair of twin primes.

2218429 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2218397 and 2218406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2218423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109214 + 1109215.

It is an arithmetic number, because the mean of its divisors is an integer number (1109215).

2^2218429 is an apocalyptic number.

It is an amenable number.

2218429 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218429 is an equidigital number, since it uses as much as digits as its factorization.

2218429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 28.

The square root of 2218429 is about 1489.4391561927. The cubic root of 2218429 is about 130.4212959373.

The spelling of 2218429 in words is "two million, two hundred eighteen thousand, four hundred twenty-nine".