129123873 has 12 divisors (see below), whose sum is σ = 187658640. Its totient is φ = 85553496.

The previous prime is 129123871. The next prime is 129123881. The reversal of 129123873 is 378321921.

It is not a de Polignac number, because 129123873 - 2¹ = 129123871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129123871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42543 + ... + 45476.

It is an arithmetic number, because the mean of its divisors is an integer number (15638220).

Almost surely, 2^129123873 is an apocalyptic number.

It is an amenable number.

129123873 is a deficient number, since it is larger than the sum of its proper divisors (58534767).

129123873 is a wasteful number, since it uses less digits than its factorization.

129123873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88188 (or 88185 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 129123873 is about 11363.2685878668. The cubic root of 129123873 is about 505.4391148453.

The spelling of 129123873 in words is "one hundred twenty-nine million, one hundred twenty-three thousand, eight hundred seventy-three".