139866 has 8 divisors (see below), whose sum is σ = 279744. Its totient is φ = 46620.

The previous prime is 139861. The next prime is 139871. The reversal of 139866 is 668931.

139866 is nontrivially palindromic in base 5.

It is an interprime number because it is at equal distance from previous prime (139861) and next prime (139871).

It is a sphenic number, since it is the product of 3 distinct primes.

139866 is an admirable number.

It is an Ulam number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139866.

It is not an unprimeable number, because it can be changed into a prime (139861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11650 + ... + 11661.

It is an arithmetic number, because the mean of its divisors is an integer number (34968).

2¹³⁹⁸⁶⁶ is an apocalyptic number.

139866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

139866 is a wasteful number, since it uses less digits than its factorization.

139866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23316.

The product of its digits is 7776, while the sum is 33.

The square root of 139866 is about 373.9866307771. The cubic root of 139866 is about 51.9083692014.

The spelling of 139866 in words is "one hundred thirty-nine thousand, eight hundred sixty-six".