85668439 has 2 divisors, whose sum is σ = 85668440. Its totient is φ = 85668438.

The previous prime is 85668421. The next prime is 85668481. The reversal of 85668439 is 93486658.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85668439 - 2¹³ = 85660247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85668392 and 85668401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85668409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42834219 + 42834220.

It is an arithmetic number, because the mean of its divisors is an integer number (42834220).

Almost surely, 2^85668439 is an apocalyptic number.

85668439 is a deficient number, since it is larger than the sum of its proper divisors (1).

85668439 is an equidigital number, since it uses as much as digits as its factorization.

85668439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The square root of 85668439 is about 9255.7246609868. The cubic root of 85668439 is about 440.8325130168.

The spelling of 85668439 in words is "eighty-five million, six hundred sixty-eight thousand, four hundred thirty-nine".