129023889 has 16 divisors (see below), whose sum is σ = 184507200. Its totient is φ = 79949376.

The previous prime is 129023887. The next prime is 129023893. The reversal of 129023889 is 988320921.

It is not a de Polignac number, because 129023889 - 2¹ = 129023887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129023889.

It is not an unprimeable number, because it can be changed into a prime (129023887) 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, 18334 + ... + 24375.

It is an arithmetic number, because the mean of its divisors is an integer number (11531700).

Almost surely, 2^129023889 is an apocalyptic number.

129023889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

129023889 is a deficient number, since it is larger than the sum of its proper divisors (55483311).

129023889 is a wasteful number, since it uses less digits than its factorization.

129023889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42784.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 129023889 is about 11358.8682975022. The cubic root of 129023889 is about 505.3086229059.

The spelling of 129023889 in words is "one hundred twenty-nine million, twenty-three thousand, eight hundred eighty-nine".