129507945 has 16 divisors (see below), whose sum is σ = 236814720. Its totient is φ = 59203584.

The previous prime is 129507943. The next prime is 129507953. The reversal of 129507945 is 549705921.

It is not a de Polignac number, because 129507945 - 2¹ = 129507943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129507897 and 129507906.

It is not an unprimeable number, because it can be changed into a prime (129507943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616600 + ... + 616809.

It is an arithmetic number, because the mean of its divisors is an integer number (14800920).

Almost surely, 2^129507945 is an apocalyptic number.

129507945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129507945 is a deficient number, since it is larger than the sum of its proper divisors (107306775).

129507945 is a wasteful number, since it uses less digits than its factorization.

129507945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233424.

The product of its (nonzero) digits is 113400, while the sum is 42.

The square root of 129507945 is about 11380.1557546459. The cubic root of 129507945 is about 505.9397526002.

The spelling of 129507945 in words is "one hundred twenty-nine million, five hundred seven thousand, nine hundred forty-five".