863857 has 8 divisors (see below), whose sum is σ = 915840. Its totient is φ = 814660.

The previous prime is 863851. The next prime is 863867. The reversal of 863857 is 758368.

It is not a de Polignac number, because 863857 - 2⁷ = 863729 is a prime.

It is a Duffinian number.

Its product of digits (40320) is a multiple of the sum of its prime factors (140).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863851) 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 7 ways as a sum of consecutive naturals, for example, 12132 + ... + 12202.

It is an arithmetic number, because the mean of its divisors is an integer number (114480).

2⁸⁶³⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

863857 is a deficient number, since it is larger than the sum of its proper divisors (51983).

863857 is an frugal number, since it uses more digits than its factorization.

863857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 94 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 863857 is about 929.4390781541. The cubic root of 863857 is about 95.2388082367.

The spelling of 863857 in words is "eight hundred sixty-three thousand, eight hundred fifty-seven".