129005000 has 40 divisors (see below), whose sum is σ = 302270430. Its totient is φ = 51600000.

The previous prime is 129004957. The next prime is 129005011. The reversal of 129005000 is 500921.

It can be written as a sum of positive squares in 5 ways, for example, as 1811716 + 127193284 = 1346^2 + 11278^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 129005000.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7901 + ... + 17900.

Almost surely, 2^129005000 is an apocalyptic number.

129005000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129005000 is an abundant number, since it is smaller than the sum of its proper divisors (173265430).

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

129005000 is an equidigital number, since it uses as much as digits as its factorization.

129005000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25827 (or 25808 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 129005000 is about 11358.0368021943. The cubic root of 129005000 is about 505.2839627687.

Adding to 129005000 its reverse (500921), we get a palindrome (129505921).

The spelling of 129005000 in words is "one hundred twenty-nine million, five thousand".