86440909 has 4 divisors (see below), whose sum is σ = 89421660. Its totient is φ = 83460160.

The previous prime is 86440891. The next prime is 86440961. The reversal of 86440909 is 90904468.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31606884 + 54834025 = 5622^2 + 7405^2 .

It is a cyclic number.

It is not a de Polignac number, because 86440909 - 2⁹ = 86440397 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86440009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1490332 + ... + 1490389.

It is an arithmetic number, because the mean of its divisors is an integer number (22355415).

Almost surely, 2^86440909 is an apocalyptic number.

It is an amenable number.

86440909 is a deficient number, since it is larger than the sum of its proper divisors (2980751).

86440909 is a wasteful number, since it uses less digits than its factorization.

86440909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980750.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 86440909 is about 9297.3603243071. The cubic root of 86440909 is about 442.1535419964.

The spelling of 86440909 in words is "eighty-six million, four hundred forty thousand, nine hundred nine".