129140505 has 36 divisors (see below), whose sum is σ = 242401068. Its totient is φ = 63573120.

The previous prime is 129140497. The next prime is 129140533. The reversal of 129140505 is 505041921.

129140505 is a `hidden beast` number, since 12 + 9 + 140 + 505 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 2442969 + 126697536 = 1563^2 + 11256^2 .

It is not a de Polignac number, because 129140505 - 2³ = 129140497 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 886 + ... + 16095.

It is an arithmetic number, because the mean of its divisors is an integer number (6733363).

Almost surely, 2^129140505 is an apocalyptic number.

129140505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129140505 is a deficient number, since it is larger than the sum of its proper divisors (113260563).

129140505 is a wasteful number, since it uses less digits than its factorization.

129140505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17018 (or 17002 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 129140505 is about 11364.0003959873. Note that the first 3 decimals coincide. The cubic root of 129140505 is about 505.4608152023.

The spelling of 129140505 in words is "one hundred twenty-nine million, one hundred forty thousand, five hundred five".