863906 has 8 divisors (see below), whose sum is σ = 1372140. Its totient is φ = 406528.

The previous prime is 863899. The next prime is 863909. The reversal of 863906 is 609368.

It is a happy number.

863906 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 855625 + 8281 = 925^2 + 91^2 .

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863909) 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, 12671 + ... + 12738.

2⁸⁶³⁹⁰⁶ is an apocalyptic number.

863906 is a deficient number, since it is larger than the sum of its proper divisors (508234).

863906 is a wasteful number, since it uses less digits than its factorization.

863906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25428.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 863906 is about 929.4654377652. The cubic root of 863906 is about 95.2406089257.

The spelling of 863906 in words is "eight hundred sixty-three thousand, nine hundred six".