129784345 has 16 divisors (see below), whose sum is σ = 168373440. Its totient is φ = 95701824.

The previous prime is 129784337. The next prime is 129784357. The reversal of 129784345 is 543487921.

It is a cyclic number.

It is not a de Polignac number, because 129784345 - 2³ = 129784337 is a prime.

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, 14947 + ... + 21976.

It is an arithmetic number, because the mean of its divisors is an integer number (10523340).

Almost surely, 2^129784345 is an apocalyptic number.

It is an amenable number.

129784345 is a deficient number, since it is larger than the sum of its proper divisors (38589095).

129784345 is a wasteful number, since it uses less digits than its factorization.

129784345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36984.

The product of its digits is 241920, while the sum is 43.

The square root of 129784345 is about 11392.2932283189. The cubic root of 129784345 is about 506.2994277808.

The spelling of 129784345 in words is "one hundred twenty-nine million, seven hundred eighty-four thousand, three hundred forty-five".