42866 has 4 divisors (see below), whose sum is σ = 64302. Its totient is φ = 21432.

The previous prime is 42863. The next prime is 42899. The reversal of 42866 is 66824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42025 + 841 = 205^2 + 29^2 .

It is a d-powerful number, because it can be written as 4⁵ + 2 + 8⁵ + 6⁴ + 6⁵ .

It is a Curzon number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (42863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715 + ... + 10718.

2⁴²⁸⁶⁶ is an apocalyptic number.

42866 is a deficient number, since it is larger than the sum of its proper divisors (21436).

42866 is a wasteful number, since it uses less digits than its factorization.

42866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21435.

The product of its digits is 2304, while the sum is 26.

The square root of 42866 is about 207.0410587299. The cubic root of 42866 is about 34.9975508490.

It can be divided in two parts, 428 and 66, that added together give a palindrome (494).

The spelling of 42866 in words is "forty-two thousand, eight hundred sixty-six".