85439689 has 4 divisors (see below), whose sum is σ = 88195840. Its totient is φ = 82683540.

The previous prime is 85439659. The next prime is 85439699. The reversal of 85439689 is 98693458.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98693458 = 2 ⋅49346729.

It is a cyclic number.

It is not a de Polignac number, because 85439689 - 2⁹ = 85439177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85439609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378029 + ... + 1378090.

It is an arithmetic number, because the mean of its divisors is an integer number (22048960).

Almost surely, 2^85439689 is an apocalyptic number.

It is an amenable number.

85439689 is a deficient number, since it is larger than the sum of its proper divisors (2756151).

85439689 is a wasteful number, since it uses less digits than its factorization.

85439689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756150.

The product of its digits is 1866240, while the sum is 52.

The square root of 85439689 is about 9243.3591837600. The cubic root of 85439689 is about 440.4397961427.

The spelling of 85439689 in words is "eighty-five million, four hundred thirty-nine thousand, six hundred eighty-nine".