866242 has 8 divisors (see below), whose sum is σ = 1399356. Its totient is φ = 399792.

The previous prime is 866231. The next prime is 866279. The reversal of 866242 is 242668.

It can be written as a sum of positive squares in 2 ways, for example, as 793881 + 72361 = 891^2 + 269^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×866242³ = 1950019548658333464, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866242.

It is an unprimeable number.

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, 16633 + ... + 16684.

2⁸⁶⁶²⁴² is an apocalyptic number.

866242 is a deficient number, since it is larger than the sum of its proper divisors (533114).

866242 is a wasteful number, since it uses less digits than its factorization.

866242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33332.

The product of its digits is 4608, while the sum is 28.

The square root of 866242 is about 930.7212257169. The cubic root of 866242 is about 95.3263751367.

It can be divided in two parts, 86 and 6242, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 866242 in words is "eight hundred sixty-six thousand, two hundred forty-two".