129395689 has 4 divisors (see below), whose sum is σ = 129690880. Its totient is φ = 129100500.

The previous prime is 129395683. The next prime is 129395711. The reversal of 129395689 is 986593921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 986593921 = 12379 ⋅79699.

It is a cyclic number.

It is not a de Polignac number, because 129395689 - 2⁵ = 129395657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129395683) 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, 146937 + ... + 147814.

It is an arithmetic number, because the mean of its divisors is an integer number (32422720).

Almost surely, 2^129395689 is an apocalyptic number.

It is an amenable number.

129395689 is a deficient number, since it is larger than the sum of its proper divisors (295191).

129395689 is an equidigital number, since it uses as much as digits as its factorization.

129395689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295190.

The product of its digits is 1049760, while the sum is 52.

The square root of 129395689 is about 11375.2225912287. Note that the first 3 decimals coincide. The cubic root of 129395689 is about 505.7935294207.

The spelling of 129395689 in words is "one hundred twenty-nine million, three hundred ninety-five thousand, six hundred eighty-nine".