85439447 has 4 divisors (see below), whose sum is σ = 89936280. Its totient is φ = 80942616.

The previous prime is 85439429. The next prime is 85439479. The reversal of 85439447 is 74493458.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85439447 - 2⁶ = 85439383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85439398 and 85439407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85439047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2248388 + ... + 2248425.

It is an arithmetic number, because the mean of its divisors is an integer number (22484070).

Almost surely, 2^85439447 is an apocalyptic number.

85439447 is a deficient number, since it is larger than the sum of its proper divisors (4496833).

85439447 is a wasteful number, since it uses less digits than its factorization.

85439447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496832.

The product of its digits is 483840, while the sum is 44.

The square root of 85439447 is about 9243.3460932716. The cubic root of 85439447 is about 440.4393803073.

The spelling of 85439447 in words is "eighty-five million, four hundred thirty-nine thousand, four hundred forty-seven".