85439143 has 4 divisors (see below), whose sum is σ = 89935960. Its totient is φ = 80942328.

The previous prime is 85439141. The next prime is 85439153. The reversal of 85439143 is 34193458.

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 85439143 - 2¹ = 85439141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85439141) 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, 2248380 + ... + 2248417.

It is an arithmetic number, because the mean of its divisors is an integer number (22483990).

Almost surely, 2^85439143 is an apocalyptic number.

85439143 is a deficient number, since it is larger than the sum of its proper divisors (4496817).

85439143 is a wasteful number, since it uses less digits than its factorization.

85439143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496816.

The product of its digits is 51840, while the sum is 37.

The square root of 85439143 is about 9243.3296489955. The cubic root of 85439143 is about 440.4388579345.

The spelling of 85439143 in words is "eighty-five million, four hundred thirty-nine thousand, one hundred forty-three".