129809845 has 16 divisors (see below), whose sum is σ = 170501760. Its totient is φ = 94091200.

The previous prime is 129809837. The next prime is 129809851. The reversal of 129809845 is 548908921.

It is not a de Polignac number, because 129809845 - 2³ = 129809837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129809795 and 129809804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13311 + ... + 20899.

It is an arithmetic number, because the mean of its divisors is an integer number (10656360).

Almost surely, 2^129809845 is an apocalyptic number.

It is an amenable number.

129809845 is a deficient number, since it is larger than the sum of its proper divisors (40691915).

129809845 is a wasteful number, since it uses less digits than its factorization.

129809845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 129809845 is about 11393.4123510035. The cubic root of 129809845 is about 506.3325848099.

The spelling of 129809845 in words is "one hundred twenty-nine million, eight hundred nine thousand, eight hundred forty-five".