86839809 has 24 divisors (see below), whose sum is σ = 135973728. Its totient is φ = 49150080.

The previous prime is 86839807. The next prime is 86839813. The reversal of 86839809 is 90893868.

It is not a de Polignac number, because 86839809 - 2¹ = 86839807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86839801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12969 + ... + 18489.

It is an arithmetic number, because the mean of its divisors is an integer number (5665572).

Almost surely, 2^86839809 is an apocalyptic number.

It is an amenable number.

86839809 is a deficient number, since it is larger than the sum of its proper divisors (49133919).

86839809 is a wasteful number, since it uses less digits than its factorization.

86839809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5645 (or 5638 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 86839809 is about 9318.7879576692. The cubic root of 86839809 is about 442.8326357134.

The spelling of 86839809 in words is "eighty-six million, eight hundred thirty-nine thousand, eight hundred nine".