47139 has 8 divisors (see below), whose sum is σ = 66240. Its totient is φ = 29736.

The previous prime is 47137. The next prime is 47143. The reversal of 47139 is 93174.

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

It is not a de Polignac number, because 47139 - 2¹ = 47137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47137) 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, 357 + ... + 470.

It is an arithmetic number, because the mean of its divisors is an integer number (8280).

2⁴⁷¹³⁹ is an apocalyptic number.

47139 is a deficient number, since it is larger than the sum of its proper divisors (19101).

47139 is a wasteful number, since it uses less digits than its factorization.

47139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849.

The product of its digits is 756, while the sum is 24.

The square root of 47139 is about 217.1151768071. The cubic root of 47139 is about 36.1238021577.

Adding to 47139 its product of digits (756), we get a triangular number (47895 = T₃₀₉).

The spelling of 47139 in words is "forty-seven thousand, one hundred thirty-nine".