139686 has 16 divisors (see below), whose sum is σ = 288768. Its totient is φ = 45000.

The previous prime is 139681. The next prime is 139697. The reversal of 139686 is 686931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139681) 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 7 ways as a sum of consecutive naturals, for example, 190 + ... + 561.

It is an arithmetic number, because the mean of its divisors is an integer number (18048).

2¹³⁹⁶⁸⁶ is an apocalyptic number.

139686 is an abundant number, since it is smaller than the sum of its proper divisors (149082).

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

139686 is a wasteful number, since it uses less digits than its factorization.

139686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787.

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

The square root of 139686 is about 373.7459029876. The cubic root of 139686 is about 51.8860918847.

The spelling of 139686 in words is "one hundred thirty-nine thousand, six hundred eighty-six".