139566 has 16 divisors (see below), whose sum is σ = 319104. Its totient is φ = 39864.

The previous prime is 139547. The next prime is 139571. The reversal of 139566 is 665931.

It is a happy number.

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 139566.

It is an unprimeable number.

139566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 1620 + ... + 1703.

It is an arithmetic number, because the mean of its divisors is an integer number (19944).

2¹³⁹⁵⁶⁶ is an apocalyptic number.

139566 is an abundant number, since it is smaller than the sum of its proper divisors (179538).

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

139566 is a wasteful number, since it uses less digits than its factorization.

139566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335.

The product of its digits is 4860, while the sum is 30.

The square root of 139566 is about 373.5853316178. The cubic root of 139566 is about 51.8712297061.

The spelling of 139566 in words is "one hundred thirty-nine thousand, five hundred sixty-six".