7139 has 6 divisors (see below), whose sum is σ = 7980.
Its totient is φ = 6380.
The previous prime is 7129. The next prime is 7151. The reversal of 7139 is 9317.
7139 = T2 + T3 + ... +
It is not a de Polignac number, because 7139 - 28 = 6883 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 11 and base 13.
It is a self number, because there is not a number n which added to its sum of digits gives 7139.
It is not an unprimeable number, because it can be changed into a prime (7109) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92 + ... + 150.
It is an arithmetic number, because the mean of its divisors is an integer number (1330).
27139 is an apocalyptic number.
7139 is a deficient number, since it is larger than the sum of its proper divisors (841).
7139 is a wasteful number, since it uses less digits than its factorization.
7139 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 81 (or 70 counting only the distinct ones).
The product of its digits is 189, while the sum is 20.
The square root of 7139 is about 84.4926032266.
The cubic root of 7139 is about 19.2551006892.
The spelling of 7139 in words is "seven thousand, one hundred thirty-nine".