139745 has 8 divisors (see below), whose sum is σ = 176640. Its totient is φ = 105840.

The previous prime is 139739. The next prime is 139747. The reversal of 139745 is 547931.

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

It is not a de Polignac number, because 139745 - 2⁴ = 139729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139747) 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, 641 + ... + 830.

It is an arithmetic number, because the mean of its divisors is an integer number (22080).

2¹³⁹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

139745 is a deficient number, since it is larger than the sum of its proper divisors (36895).

139745 is a wasteful number, since it uses less digits than its factorization.

139745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495.

The product of its digits is 3780, while the sum is 29.

The square root of 139745 is about 373.8248252859. The cubic root of 139745 is about 51.8933960014.

The spelling of 139745 in words is "one hundred thirty-nine thousand, seven hundred forty-five".