42209863 has 2 divisors, whose sum is σ = 42209864. Its totient is φ = 42209862.

The previous prime is 42209851. The next prime is 42209897. The reversal of 42209863 is 36890224.

It is an a-pointer prime, because the next prime (42209897) can be obtained adding 42209863 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42209863 - 2⁵ = 42209831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42209803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104931 + 21104932.

It is an arithmetic number, because the mean of its divisors is an integer number (21104932).

Almost surely, 2^42209863 is an apocalyptic number.

42209863 is a deficient number, since it is larger than the sum of its proper divisors (1).

42209863 is an equidigital number, since it uses as much as digits as its factorization.

42209863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 42209863 is about 6496.9118048501. The cubic root of 42209863 is about 348.1806626783.

The spelling of 42209863 in words is "forty-two million, two hundred nine thousand, eight hundred sixty-three".