129889899 has 20 divisors (see below), whose sum is σ = 194347296. Its totient is φ = 86453136.

The previous prime is 129889891. The next prime is 129889913. The reversal of 129889899 is 998988921.

It is not a de Polignac number, because 129889899 - 2³ = 129889891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129889891) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 81262 + ... + 82844.

Almost surely, 2^129889899 is an apocalyptic number.

129889899 is a deficient number, since it is larger than the sum of its proper divisors (64457397).

129889899 is a wasteful number, since it uses less digits than its factorization.

129889899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608 (or 2599 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 63.

The square root of 129889899 is about 11396.9249800111. The cubic root of 129889899 is about 506.4366488716.

The spelling of 129889899 in words is "one hundred twenty-nine million, eight hundred eighty-nine thousand, eight hundred ninety-nine".