129000039 has 16 divisors (see below), whose sum is σ = 200282112. Its totient is φ = 72322848.

The previous prime is 129000037. The next prime is 129000049. The reversal of 129000039 is 930000921.

It is a happy number.

It is not a de Polignac number, because 129000039 - 2¹ = 129000037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128999982 and 129000018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129000037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56839 + ... + 59064.

It is an arithmetic number, because the mean of its divisors is an integer number (12517632).

Almost surely, 2^129000039 is an apocalyptic number.

129000039 is a deficient number, since it is larger than the sum of its proper divisors (71282073).

129000039 is a wasteful number, since it uses less digits than its factorization.

129000039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115966.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 129000039 is about 11357.8184084797. The cubic root of 129000039 is about 505.2774856403.

The spelling of 129000039 in words is "one hundred twenty-nine million, thirty-nine", and thus it is an aban number.