863409 has 8 divisors (see below), whose sum is σ = 1156480. Its totient is φ = 572976.

The previous prime is 863393. The next prime is 863479. The reversal of 863409 is 904368.

863409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 863409 - 2⁴ = 863393 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 863409.

It is not an unprimeable number, because it can be changed into a prime (863479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312 + ... + 1350.

It is an arithmetic number, because the mean of its divisors is an integer number (144560).

2⁸⁶³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

863409 is a deficient number, since it is larger than the sum of its proper divisors (293071).

863409 is a wasteful number, since it uses less digits than its factorization.

863409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 863409 is about 929.1980413238. The cubic root of 863409 is about 95.2223416364. Note that the first 3 decimals are identical.

The spelling of 863409 in words is "eight hundred sixty-three thousand, four hundred nine".