129078172 has 24 divisors (see below), whose sum is σ = 245450240. Its totient is φ = 59168880.

The previous prime is 129078151. The next prime is 129078181. The reversal of 129078172 is 271870921.

It is a super-3 number, since 3×129078172³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25038 + ... + 29749.

Almost surely, 2^129078172 is an apocalyptic number.

It is an amenable number.

129078172 is a deficient number, since it is larger than the sum of its proper divisors (116372068).

129078172 is a wasteful number, since it uses less digits than its factorization.

129078172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54841 (or 54839 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 129078172 is about 11361.2575008227. The cubic root of 129078172 is about 505.3794775421.

The spelling of 129078172 in words is "one hundred twenty-nine million, seventy-eight thousand, one hundred seventy-two".