129273975 has 30 divisors (see below), whose sum is σ = 239463840. Its totient is φ = 68945040.

The previous prime is 129273971. The next prime is 129274027. The reversal of 129273975 is 579372921.

It is not a de Polignac number, because 129273975 - 2² = 129273971 is a prime.

It is a super-2 number, since 2×129273975² = 33423521224601250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 129273975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129273971) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 29895 + ... + 33944.

It is an arithmetic number, because the mean of its divisors is an integer number (7982128).

Almost surely, 2^129273975 is an apocalyptic number.

129273975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129273975 is a deficient number, since it is larger than the sum of its proper divisors (110189865).

129273975 is an equidigital number, since it uses as much as digits as its factorization.

129273975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63861 (or 63847 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 129273975 is about 11369.8713713041. The cubic root of 129273975 is about 505.6348907863.

The spelling of 129273975 in words is "one hundred twenty-nine million, two hundred seventy-three thousand, nine hundred seventy-five".