135866 has 4 divisors (see below), whose sum is σ = 203802. Its totient is φ = 67932.

The previous prime is 135859. The next prime is 135887. The reversal of 135866 is 668531.

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., 87025 + 48841 = 295^2 + 221^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33965 + ... + 33968.

2¹³⁵⁸⁶⁶ is an apocalyptic number.

135866 is a deficient number, since it is larger than the sum of its proper divisors (67936).

135866 is an equidigital number, since it uses as much as digits as its factorization.

135866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67935.

The product of its digits is 4320, while the sum is 29.

The square root of 135866 is about 368.6000542594. The cubic root of 135866 is about 51.4087364721.

It can be divided in two parts, 135 and 866, that added together give a palindrome (1001).

The spelling of 135866 in words is "one hundred thirty-five thousand, eight hundred sixty-six".