42218849 has 2 divisors, whose sum is σ = 42218850. Its totient is φ = 42218848.

The previous prime is 42218833. The next prime is 42218881. The reversal of 42218849 is 94881224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34339600 + 7879249 = 5860^2 + 2807^2 .

It is a cyclic number.

It is not a de Polignac number, because 42218849 - 2⁴ = 42218833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42218149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21109424 + 21109425.

It is an arithmetic number, because the mean of its divisors is an integer number (21109425).

Almost surely, 2^42218849 is an apocalyptic number.

It is an amenable number.

42218849 is a deficient number, since it is larger than the sum of its proper divisors (1).

42218849 is an equidigital number, since it uses as much as digits as its factorization.

42218849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 38.

The square root of 42218849 is about 6497.6033273816. The cubic root of 42218849 is about 348.2053688269.

The spelling of 42218849 in words is "forty-two million, two hundred eighteen thousand, eight hundred forty-nine".