85784243 has 2 divisors, whose sum is σ = 85784244. Its totient is φ = 85784242.

The previous prime is 85784201. The next prime is 85784327. The reversal of 85784243 is 34248758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85784243 - 2²⁴ = 69007027 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 85784243.

It is not a weakly prime, because it can be changed into another prime (85784143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42892121 + 42892122.

It is an arithmetic number, because the mean of its divisors is an integer number (42892122).

Almost surely, 2^85784243 is an apocalyptic number.

85784243 is a deficient number, since it is larger than the sum of its proper divisors (1).

85784243 is an equidigital number, since it uses as much as digits as its factorization.

85784243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 41.

The square root of 85784243 is about 9261.9783523824. The cubic root of 85784243 is about 441.0310582590.

It can be divided in two parts, 8578 and 4243, that added together give a palindrome (12821).

The spelling of 85784243 in words is "eighty-five million, seven hundred eighty-four thousand, two hundred forty-three".