139045 has 4 divisors (see below), whose sum is σ = 166860. Its totient is φ = 111232.

The previous prime is 139033. The next prime is 139067. The reversal of 139045 is 540931.

139045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540931 = 113 ⋅4787.

It can be written as a sum of positive squares in 2 ways, for example, as 74529 + 64516 = 273^2 + 254^2 .

It is a cyclic number.

It is not a de Polignac number, because 139045 - 2⁷ = 138917 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13900 + ... + 13909.

It is an arithmetic number, because the mean of its divisors is an integer number (41715).

2¹³⁹⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

139045 is a deficient number, since it is larger than the sum of its proper divisors (27815).

139045 is an equidigital number, since it uses as much as digits as its factorization.

139045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27814.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 139045 is about 372.8873824629. The cubic root of 139045 is about 51.8066041082.

Adding to 139045 its reverse (540931), we get a palindrome (679976).

The spelling of 139045 in words is "one hundred thirty-nine thousand, forty-five".