139785 has 8 divisors (see below), whose sum is σ = 223680. Its totient is φ = 74544.

The previous prime is 139759. The next prime is 139787. The reversal of 139785 is 587931.

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

It is not a de Polignac number, because 139785 - 2⁵ = 139753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4645 + ... + 4674.

It is an arithmetic number, because the mean of its divisors is an integer number (27960).

2¹³⁹⁷⁸⁵ is an apocalyptic number.

139785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139785 is a deficient number, since it is larger than the sum of its proper divisors (83895).

139785 is an equidigital number, since it uses as much as digits as its factorization.

139785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9327.

The product of its digits is 7560, while the sum is 33.

The square root of 139785 is about 373.8783224526. The cubic root of 139785 is about 51.8983467756.

The spelling of 139785 in words is "one hundred thirty-nine thousand, seven hundred eighty-five".