129995750 has 32 divisors (see below), whose sum is σ = 247968864. Its totient is φ = 51012000.

The previous prime is 129995717. The next prime is 129995771. The reversal of 129995750 is 57599921.

It is a junction number, because it is equal to n+sod(n) for n = 129995695 and 129995704.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8345 + ... + 18155.

It is an arithmetic number, because the mean of its divisors is an integer number (7749027).

Almost surely, 2^129995750 is an apocalyptic number.

129995750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129995750 is a deficient number, since it is larger than the sum of its proper divisors (117973114).

129995750 is an equidigital number, since it uses as much as digits as its factorization.

129995750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9881 (or 9871 counting only the distinct ones).

The product of its (nonzero) digits is 255150, while the sum is 47.

The square root of 129995750 is about 11401.5678746390. The cubic root of 129995750 is about 506.5741814301.

The spelling of 129995750 in words is "one hundred twenty-nine million, nine hundred ninety-five thousand, seven hundred fifty".