863953 has 4 divisors (see below), whose sum is σ = 880308. Its totient is φ = 847600.

The previous prime is 863921. The next prime is 863959. The reversal of 863953 is 359368.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 677329 + 186624 = 823^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 863953 - 2⁵ = 863921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8098 + ... + 8203.

It is an arithmetic number, because the mean of its divisors is an integer number (220077).

2⁸⁶³⁹⁵³ is an apocalyptic number.

It is an amenable number.

863953 is a deficient number, since it is larger than the sum of its proper divisors (16355).

863953 is a wasteful number, since it uses less digits than its factorization.

863953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16354.

The product of its digits is 19440, while the sum is 34.

The square root of 863953 is about 929.4907207713. The cubic root of 863953 is about 95.2423360532.

The spelling of 863953 in words is "eight hundred sixty-three thousand, nine hundred fifty-three".