129071500 has 24 divisors (see below), whose sum is σ = 281893248. Its totient is φ = 51628400.

The previous prime is 129071491. The next prime is 129071513. The reversal of 129071500 is 5170921.

It is a super-2 number, since 2×129071500² = 33318904224500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128572 + ... + 129571.

It is an arithmetic number, because the mean of its divisors is an integer number (11745552).

Almost surely, 2^129071500 is an apocalyptic number.

129071500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129071500 is an abundant number, since it is smaller than the sum of its proper divisors (152821748).

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

129071500 is a wasteful number, since it uses less digits than its factorization.

129071500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258162 (or 258150 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 129071500 is about 11360.9638675598. The cubic root of 129071500 is about 505.3707697698.

The spelling of 129071500 in words is "one hundred twenty-nine million, seventy-one thousand, five hundred".