866436 has 24 divisors (see below), whose sum is σ = 2044224. Its totient is φ = 285600.

The previous prime is 866431. The next prime is 866443. The reversal of 866436 is 634668.

It is a super-2 number, since 2×866436² = 1501422684192, which contains 22 as substring.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 866397 and 866406.

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 7 ways as a sum of consecutive naturals, for example, 886 + ... + 1586.

It is an arithmetic number, because the mean of its divisors is an integer number (85176).

2⁸⁶⁶⁴³⁶ is an apocalyptic number.

It is an amenable number.

866436 is an abundant number, since it is smaller than the sum of its proper divisors (1177788).

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

866436 is a wasteful number, since it uses less digits than its factorization.

866436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 809 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 866436 is about 930.8254401336. The cubic root of 866436 is about 95.3334909067. Note that the first 3 decimals are identical.

The spelling of 866436 in words is "eight hundred sixty-six thousand, four hundred thirty-six".