129207845 has 16 divisors (see below), whose sum is σ = 172365312. Its totient is φ = 92335680.

The previous prime is 129207833. The next prime is 129207853. The reversal of 129207845 is 548702921.

It is not a de Polignac number, because 129207845 - 2⁴ = 129207829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129207799 and 129207808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30047 + ... + 34076.

It is an arithmetic number, because the mean of its divisors is an integer number (10772832).

Almost surely, 2^129207845 is an apocalyptic number.

It is an amenable number.

129207845 is a deficient number, since it is larger than the sum of its proper divisors (43157467).

129207845 is a wasteful number, since it uses less digits than its factorization.

129207845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64172.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 129207845 is about 11366.9628749284. The cubic root of 129207845 is about 505.5486570371.

The spelling of 129207845 in words is "one hundred twenty-nine million, two hundred seven thousand, eight hundred forty-five".