866438 has 12 divisors (see below), whose sum is σ = 1377180. Its totient is φ = 407700.

The previous prime is 866431. The next prime is 866443. The reversal of 866438 is 834668.

It is a junction number, because it is equal to n+sod(n) for n = 866398 and 866407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5663 + ... + 5813.

It is an arithmetic number, because the mean of its divisors is an integer number (114765).

2⁸⁶⁶⁴³⁸ is an apocalyptic number.

866438 is a deficient number, since it is larger than the sum of its proper divisors (510742).

866438 is a wasteful number, since it uses less digits than its factorization.

866438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 172 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 866438 is about 930.8265144483. The cubic root of 866438 is about 95.3335642596. Note that the first 3 decimals are identical.

The spelling of 866438 in words is "eight hundred sixty-six thousand, four hundred thirty-eight".