85872239 has 2 divisors, whose sum is σ = 85872240. Its totient is φ = 85872238.

The previous prime is 85872221. The next prime is 85872251. The reversal of 85872239 is 93227858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85872239 - 2²⁰ = 84823663 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85872239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85871239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42936119 + 42936120.

It is an arithmetic number, because the mean of its divisors is an integer number (42936120).

Almost surely, 2^85872239 is an apocalyptic number.

85872239 is a deficient number, since it is larger than the sum of its proper divisors (1).

85872239 is an equidigital number, since it uses as much as digits as its factorization.

85872239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 85872239 is about 9266.7275237810. The cubic root of 85872239 is about 441.1818074150.

The spelling of 85872239 in words is "eighty-five million, eight hundred seventy-two thousand, two hundred thirty-nine".