86444909 has 4 divisors (see below), whose sum is σ = 86488380. Its totient is φ = 86401440.

The previous prime is 86444903. The next prime is 86444947. The reversal of 86444909 is 90944468.

It is a happy number.

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 64561225 + 21883684 = 8035^2 + 4678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86444909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86444909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86444903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18602 + ... + 22779.

It is an arithmetic number, because the mean of its divisors is an integer number (21622095).

Almost surely, 2^86444909 is an apocalyptic number.

It is an amenable number.

86444909 is a deficient number, since it is larger than the sum of its proper divisors (43471).

86444909 is a wasteful number, since it uses less digits than its factorization.

86444909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43470.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 86444909 is about 9297.5754366394. The cubic root of 86444909 is about 442.1603620191.

The spelling of 86444909 in words is "eighty-six million, four hundred forty-four thousand, nine hundred nine".