129000139 has 4 divisors (see below), whose sum is σ = 135789640. Its totient is φ = 122210640.

The previous prime is 129000103. The next prime is 129000143. The reversal of 129000139 is 931000921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931000921 = 197 ⋅4725893.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129000139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129000239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3394722 + ... + 3394759.

It is an arithmetic number, because the mean of its divisors is an integer number (33947410).

Almost surely, 2^129000139 is an apocalyptic number.

129000139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129000139 is a deficient number, since it is larger than the sum of its proper divisors (6789501).

129000139 is an equidigital number, since it uses as much as digits as its factorization.

129000139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6789500.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 129000139 is about 11357.8228107327. The cubic root of 129000139 is about 505.2776162029.

The spelling of 129000139 in words is "one hundred twenty-nine million, one hundred thirty-nine", and thus it is an aban number.