75139 has 4 divisors (see below), whose sum is σ = 77760. Its totient is φ = 72520.

The previous prime is 75133. The next prime is 75149. The reversal of 75139 is 93157.

75139 = T₅₇ + T₅₈ + ... + T₈₅.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93157 = 19 ⋅4903.

It is a cyclic number.

It is not a de Polignac number, because 75139 - 2⁷ = 75011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75133) 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 3 ways as a sum of consecutive naturals, for example, 1267 + ... + 1324.

It is an arithmetic number, because the mean of its divisors is an integer number (19440).

2⁷⁵¹³⁹ is an apocalyptic number.

75139 is a deficient number, since it is larger than the sum of its proper divisors (2621).

75139 is a wasteful number, since it uses less digits than its factorization.

75139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620.

The product of its digits is 945, while the sum is 25.

The square root of 75139 is about 274.1149393959. The cubic root of 75139 is about 42.1976698847.

The spelling of 75139 in words is "seventy-five thousand, one hundred thirty-nine".