129896889 has 4 divisors (see below), whose sum is σ = 173195856. Its totient is φ = 86597924.

The previous prime is 129896869. The next prime is 129896911. The reversal of 129896889 is 988698921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129896889 - 2⁷ = 129896761 is a prime.

It is a super-3 number, since 3×129896889³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (129896869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21649479 + ... + 21649484.

It is an arithmetic number, because the mean of its divisors is an integer number (43298964).

Almost surely, 2^129896889 is an apocalyptic number.

It is an amenable number.

129896889 is a deficient number, since it is larger than the sum of its proper divisors (43298967).

129896889 is an equidigital number, since it uses as much as digits as its factorization.

129896889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43298966.

The product of its digits is 4478976, while the sum is 60.

The square root of 129896889 is about 11397.2316375513. The cubic root of 129896889 is about 506.4457333057.

The spelling of 129896889 in words is "one hundred twenty-nine million, eight hundred ninety-six thousand, eight hundred eighty-nine".