129623039 has 16 divisors (see below), whose sum is σ = 162935808. Its totient is φ = 100373472.

The previous prime is 129623033. The next prime is 129623047. The reversal of 129623039 is 930326921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129623039 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129623033) 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, 10877 + ... + 19430.

It is an arithmetic number, because the mean of its divisors is an integer number (10183488).

Almost surely, 2^129623039 is an apocalyptic number.

129623039 is a deficient number, since it is larger than the sum of its proper divisors (33312769).

129623039 is a wasteful number, since it uses less digits than its factorization.

129623039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30374.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 129623039 is about 11385.2114165702. The cubic root of 129623039 is about 506.0895848197.

The spelling of 129623039 in words is "one hundred twenty-nine million, six hundred twenty-three thousand, thirty-nine".