125866 has 16 divisors (see below), whose sum is σ = 209664. Its totient is φ = 56304.

The previous prime is 125863. The next prime is 125887. The reversal of 125866 is 668521.

It is not an unprimeable number, because it can be changed into a prime (125863) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1171 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (13104).

2¹²⁵⁸⁶⁶ is an apocalyptic number.

125866 is a deficient number, since it is larger than the sum of its proper divisors (83798).

125866 is a wasteful number, since it uses less digits than its factorization.

125866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165.

The product of its digits is 2880, while the sum is 28.

The square root of 125866 is about 354.7759856586. The cubic root of 125866 is about 50.1152010372.

It can be divided in two parts, 1258 and 66, that multiplied together give a triangular number (83028 = T₄₀₇).

The spelling of 125866 in words is "one hundred twenty-five thousand, eight hundred sixty-six".