139868 has 12 divisors (see below), whose sum is σ = 248640. Its totient is φ = 68832.

The previous prime is 139861. The next prime is 139871. The reversal of 139868 is 868931.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139868.

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, 53 + ... + 531.

It is an arithmetic number, because the mean of its divisors is an integer number (20720).

2¹³⁹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

139868 is a deficient number, since it is larger than the sum of its proper divisors (108772).

139868 is a wasteful number, since it uses less digits than its factorization.

139868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 554 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 139868 is about 373.9893046599. The cubic root of 139868 is about 51.9086166197.

The spelling of 139868 in words is "one hundred thirty-nine thousand, eight hundred sixty-eight".