86509905 has 16 divisors (see below), whose sum is σ = 138948480. Its totient is φ = 45961088.

The previous prime is 86509903. The next prime is 86509949. The reversal of 86509905 is 50990568.

It is a cyclic number.

It is not a de Polignac number, because 86509905 - 2¹ = 86509903 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86509901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7020 + ... + 14909.

It is an arithmetic number, because the mean of its divisors is an integer number (8684280).

Almost surely, 2^86509905 is an apocalyptic number.

It is an amenable number.

86509905 is a deficient number, since it is larger than the sum of its proper divisors (52438575).

86509905 is a wasteful number, since it uses less digits than its factorization.

86509905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22200.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 86509905 is about 9301.0700997251. The cubic root of 86509905 is about 442.2711510969.

The spelling of 86509905 in words is "eighty-six million, five hundred nine thousand, nine hundred five".