866426 has 8 divisors (see below), whose sum is σ = 1417824. Its totient is φ = 393820.

The previous prime is 866417. The next prime is 866431. The reversal of 866426 is 624668.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 866392 and 866401.

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, 19670 + ... + 19713.

It is an arithmetic number, because the mean of its divisors is an integer number (177228).

2⁸⁶⁶⁴²⁶ is an apocalyptic number.

866426 is a deficient number, since it is larger than the sum of its proper divisors (551398).

866426 is a wasteful number, since it uses less digits than its factorization.

866426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39396.

The product of its digits is 13824, while the sum is 32.

The square root of 866426 is about 930.8200685417. The cubic root of 866426 is about 95.3331241404. Note that the first 3 decimals are identical.

The spelling of 866426 in words is "eight hundred sixty-six thousand, four hundred twenty-six".