129975612 has 24 divisors (see below), whose sum is σ = 326605776. Its totient is φ = 39992448.

The previous prime is 129975607. The next prime is 129975613. The reversal of 129975612 is 216579921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129975613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416433 + ... + 416744.

It is an arithmetic number, because the mean of its divisors is an integer number (13608574).

Almost surely, 2^129975612 is an apocalyptic number.

129975612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129975612 is an abundant number, since it is smaller than the sum of its proper divisors (196630164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129975612 is a wasteful number, since it uses less digits than its factorization.

129975612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833197 (or 833195 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 129975612 is about 11400.6847162791. The cubic root of 129975612 is about 506.5480218116.

The spelling of 129975612 in words is "one hundred twenty-nine million, nine hundred seventy-five thousand, six hundred twelve".