139685 has 16 divisors (see below), whose sum is σ = 206976. Its totient is φ = 88128.
The previous prime is 139681. The next prime is 139697. The reversal of 139685 is 586931.
It is a cyclic number.
It is not a de Polignac number, because 139685 - 22 = 139681 is a prime.
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 15 ways as a sum of consecutive naturals, for example, 302 + ... + 608.
It is an arithmetic number, because the mean of its divisors is an integer number (12936).
2139685 is an apocalyptic number.
It is an amenable number.
139685 is a deficient number, since it is larger than the sum of its proper divisors (67291).
139685 is a wasteful number, since it uses less digits than its factorization.
139685 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 332.
The product of its digits is 6480, while the sum is 32.
The square root of 139685 is about 373.7445651779. The cubic root of 139685 is about 51.8859680684.
The spelling of 139685 in words is "one hundred thirty-nine thousand, six hundred eighty-five".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.064 sec. • engine limits •