129757995 has 48 divisors (see below), whose sum is σ = 229975200. Its totient is φ = 67668480.

The previous prime is 129757981. The next prime is 129757997. The reversal of 129757995 is 599757921.

129757995 is a nontrivial binomial coefficient, being equal to C(16110, 2).

It is not a de Polignac number, because 129757995 - 2⁶ = 129757931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129757997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 716805 + ... + 716985.

It is an arithmetic number, because the mean of its divisors is an integer number (4791150).

Almost surely, 2^129757995 is an apocalyptic number.

129757995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129757995 is the 16109-th triangular number and also the 8055-th hexagonal number.

129757995 is a deficient number, since it is larger than the sum of its proper divisors (100217205).

129757995 is a wasteful number, since it uses less digits than its factorization.

129757995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460 (or 457 counting only the distinct ones).

The product of its digits is 1786050, while the sum is 54.

The square root of 129757995 is about 11391.1366860380. The cubic root of 129757995 is about 506.2651609543.

The spelling of 129757995 in words is "one hundred twenty-nine million, seven hundred fifty-seven thousand, nine hundred ninety-five".