42783217 has 2 divisors, whose sum is σ = 42783218. Its totient is φ = 42783216.

The previous prime is 42783179. The next prime is 42783241. The reversal of 42783217 is 71238724.

42783217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37405456 + 5377761 = 6116^2 + 2319^2 .

It is a cyclic number.

It is not a de Polignac number, because 42783217 - 2¹⁹ = 42258929 is a prime.

It is not a weakly prime, because it can be changed into another prime (42783277) 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, 21391608 + 21391609.

It is an arithmetic number, because the mean of its divisors is an integer number (21391609).

Almost surely, 2^42783217 is an apocalyptic number.

It is an amenable number.

42783217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42783217 is an equidigital number, since it uses as much as digits as its factorization.

42783217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 34.

The square root of 42783217 is about 6540.8880895487. Note that the first 3 decimals coincide. The cubic root of 42783217 is about 349.7500719139.

The spelling of 42783217 in words is "forty-two million, seven hundred eighty-three thousand, two hundred seventeen".