85739831 has 8 divisors (see below), whose sum is σ = 89958528. Its totient is φ = 81612000.

The previous prime is 85739779. The next prime is 85739839. The reversal of 85739831 is 13893758.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85739831 - 2¹⁸ = 85477687 is a prime.

It is a super-2 number, since 2×85739831² = 14702637239817122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85739839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20780 + ... + 24561.

It is an arithmetic number, because the mean of its divisors is an integer number (11244816).

Almost surely, 2^85739831 is an apocalyptic number.

85739831 is a deficient number, since it is larger than the sum of its proper divisors (4218697).

85739831 is a wasteful number, since it uses less digits than its factorization.

85739831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45433.

The product of its digits is 181440, while the sum is 44.

The square root of 85739831 is about 9259.5804980571. The cubic root of 85739831 is about 440.9549352950.

The spelling of 85739831 in words is "eighty-five million, seven hundred thirty-nine thousand, eight hundred thirty-one".