85861439 has 2 divisors, whose sum is σ = 85861440. Its totient is φ = 85861438.

The previous prime is 85861427. The next prime is 85861459. The reversal of 85861439 is 93416858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85861439 - 2⁸ = 85861183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85861439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85861459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42930719 + 42930720.

It is an arithmetic number, because the mean of its divisors is an integer number (42930720).

Almost surely, 2^85861439 is an apocalyptic number.

85861439 is a deficient number, since it is larger than the sum of its proper divisors (1).

85861439 is an equidigital number, since it uses as much as digits as its factorization.

85861439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 85861439 is about 9266.1447754716. The cubic root of 85861439 is about 441.1633110870.

The spelling of 85861439 in words is "eighty-five million, eight hundred sixty-one thousand, four hundred thirty-nine".