866156 has 12 divisors (see below), whose sum is σ = 1535520. Its totient is φ = 427440.

The previous prime is 866123. The next prime is 866161. The reversal of 866156 is 651668.

Added to its reverse (651668) it gives a square (1517824 = 1232²).

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (127960).

2⁸⁶⁶¹⁵⁶ is an apocalyptic number.

It is an amenable number.

866156 is a deficient number, since it is larger than the sum of its proper divisors (669364).

866156 is a wasteful number, since it uses less digits than its factorization.

866156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824 (or 2822 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 866156 is about 930.6750238402. The cubic root of 866156 is about 95.3232203833.

Adding to 866156 its reverse (651668), we get a square (1517824 = 1232²).

It can be divided in two parts, 86615 and 6, that multiplied together give a triangular number (519690 = T₁₀₁₉).

The spelling of 866156 in words is "eight hundred sixty-six thousand, one hundred fifty-six".