863209853 has 16 divisors (see below), whose sum is σ = 986515200. Its totient is φ = 748063680.

The previous prime is 863209847. The next prime is 863209891. The reversal of 863209853 is 358902368.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863209853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863209813) 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, 8075 + ... + 42327.

It is an arithmetic number, because the mean of its divisors is an integer number (61657200).

Almost surely, 2^863209853 is an apocalyptic number.

It is an amenable number.

863209853 is a deficient number, since it is larger than the sum of its proper divisors (123305347).

863209853 is a wasteful number, since it uses less digits than its factorization.

863209853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34372.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 863209853 is about 29380.4331656291. The cubic root of 863209853 is about 952.1501999937.

Adding to 863209853 its reverse (358902368), we get a palindrome (1222112221).

The spelling of 863209853 in words is "eight hundred sixty-three million, two hundred nine thousand, eight hundred fifty-three".