85705439 has 4 divisors (see below), whose sum is σ = 86083224. Its totient is φ = 85327656.

The previous prime is 85705423. The next prime is 85705463. The reversal of 85705439 is 93450758.

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 85705439 - 2⁴ = 85705423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85705396 and 85705405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85705489) 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, 188552 + ... + 189005.

It is an arithmetic number, because the mean of its divisors is an integer number (21520806).

Almost surely, 2^85705439 is an apocalyptic number.

85705439 is a deficient number, since it is larger than the sum of its proper divisors (377785).

85705439 is a wasteful number, since it uses less digits than its factorization.

85705439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377784.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 85705439 is about 9257.7232082192. The cubic root of 85705439 is about 440.8959687287.

The spelling of 85705439 in words is "eighty-five million, seven hundred five thousand, four hundred thirty-nine".