863649 has 16 divisors (see below), whose sum is σ = 1324800. Its totient is φ = 555408.

The previous prime is 863641. The next prime is 863671. The reversal of 863649 is 946368.

863649 is a `hidden beast` number, since 8 + 6 + 3 + 649 = 666.

863649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 863649 - 2³ = 863641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863641) 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, 232 + ... + 1334.

It is an arithmetic number, because the mean of its divisors is an integer number (82800).

2⁸⁶³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

863649 is a deficient number, since it is larger than the sum of its proper divisors (461151).

863649 is a wasteful number, since it uses less digits than its factorization.

863649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141 (or 1135 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 863649 is about 929.3271759720. The cubic root of 863649 is about 95.2311637376.

The spelling of 863649 in words is "eight hundred sixty-three thousand, six hundred forty-nine".