864840609 has 12 divisors (see below), whose sum is σ = 1322697636. Its totient is φ = 542644992.

The previous prime is 864840583. The next prime is 864840611. The reversal of 864840609 is 906048468.

It is a happy number.

864840609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 453562209 + 411278400 = 21297^2 + 20280^2 .

It is not a de Polignac number, because 864840609 - 2⁵ = 864840577 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (864840659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2826124 + ... + 2826429.

It is an arithmetic number, because the mean of its divisors is an integer number (110224803).

Almost surely, 2^864840609 is an apocalyptic number.

It is an amenable number.

864840609 is a deficient number, since it is larger than the sum of its proper divisors (457857027).

864840609 is a wasteful number, since it uses less digits than its factorization.

864840609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5652576 (or 5652573 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 864840609 is about 29408.1724865725. The cubic root of 864840609 is about 952.7494161559.

The spelling of 864840609 in words is "eight hundred sixty-four million, eight hundred forty thousand, six hundred nine".