85858639 has 2 divisors, whose sum is σ = 85858640. Its totient is φ = 85858638.

The previous prime is 85858631. The next prime is 85858651. The reversal of 85858639 is 93685858.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85858639 - 2³ = 85858631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85858631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42929319 + 42929320.

It is an arithmetic number, because the mean of its divisors is an integer number (42929320).

Almost surely, 2^85858639 is an apocalyptic number.

85858639 is a deficient number, since it is larger than the sum of its proper divisors (1).

85858639 is an equidigital number, since it uses as much as digits as its factorization.

85858639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 52.

The square root of 85858639 is about 9265.9936865940. The cubic root of 85858639 is about 441.1585154896.

The spelling of 85858639 in words is "eighty-five million, eight hundred fifty-eight thousand, six hundred thirty-nine".