158139 has 8 divisors (see below), whose sum is σ = 234320. Its totient is φ = 105408.

The previous prime is 158129. The next prime is 158141. The reversal of 158139 is 931851.

It is not a de Polignac number, because 158139 - 2⁹ = 157627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5857 = 158139 / (1 + 5 + 8 + 1 + 3 + 9).

It is a Duffinian number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158139.

It is not an unprimeable number, because it can be changed into a prime (158129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2902 + ... + 2955.

It is an arithmetic number, because the mean of its divisors is an integer number (29290).

2¹⁵⁸¹³⁹ is an apocalyptic number.

158139 is a deficient number, since it is larger than the sum of its proper divisors (76181).

158139 is an equidigital number, since it uses as much as digits as its factorization.

158139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5866 (or 5860 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 158139 is about 397.6669460742. Note that the first 3 decimals coincide. The cubic root of 158139 is about 54.0770505012.

The spelling of 158139 in words is "one hundred fifty-eight thousand, one hundred thirty-nine".