868289409 has 16 divisors (see below), whose sum is σ = 1385305600. Its totient is φ = 534331728.

The previous prime is 868289369. The next prime is 868289449. The reversal of 868289409 is 904982868.

868289409 is a `hidden beast` number, since 86 + 82 + 89 + 409 = 666.

It is an interprime number because it is at equal distance from previous prime (868289369) and next prime (868289449).

It is not a de Polignac number, because 868289409 - 2¹⁹ = 867765121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (868289449) 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, 1236529 + ... + 1237230.

It is an arithmetic number, because the mean of its divisors is an integer number (86581600).

Almost surely, 2^868289409 is an apocalyptic number.

It is an amenable number.

868289409 is a deficient number, since it is larger than the sum of its proper divisors (517016191).

868289409 is a wasteful number, since it uses less digits than its factorization.

868289409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473781 (or 2473775 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 868289409 is about 29466.7509067423. The cubic root of 868289409 is about 954.0141902877.

The spelling of 868289409 in words is "eight hundred sixty-eight million, two hundred eighty-nine thousand, four hundred nine".