863870 has 48 divisors (see below), whose sum is σ = 1896048. Its totient is φ = 282240.

The previous prime is 863869. The next prime is 863879. The reversal of 863870 is 78368.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20069 + ... + 20111.

It is an arithmetic number, because the mean of its divisors is an integer number (39501).

2⁸⁶³⁸⁷⁰ is an apocalyptic number.

863870 is an abundant number, since it is smaller than the sum of its proper divisors (1032178).

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

863870 is a wasteful number, since it uses less digits than its factorization.

863870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 863870 is about 929.4460715932. The cubic root of 863870 is about 95.2392859772.

The spelling of 863870 in words is "eight hundred sixty-three thousand, eight hundred seventy".