863646 has 16 divisors (see below), whose sum is σ = 1974144. Its totient is φ = 246744.

The previous prime is 863641. The next prime is 863671. The reversal of 863646 is 646368.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863641) by changing a digit.

863646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10240 + ... + 10323.

It is an arithmetic number, because the mean of its divisors is an integer number (123384).

2⁸⁶³⁶⁴⁶ is an apocalyptic number.

863646 is an abundant number, since it is smaller than the sum of its proper divisors (1110498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

863646 is a wasteful number, since it uses less digits than its factorization.

863646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20575.

The product of its digits is 20736, while the sum is 33.

The square root of 863646 is about 929.3255618996. The cubic root of 863646 is about 95.2310534714.

The spelling of 863646 in words is "eight hundred sixty-three thousand, six hundred forty-six".