129500007 has 16 divisors (see below), whose sum is σ = 212513280. Its totient is φ = 68307552.

The previous prime is 129499973. The next prime is 129500023. The reversal of 129500007 is 700005921.

It is not a de Polignac number, because 129500007 - 2⁷ = 129499879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129500007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129500027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236907 + ... + 237452.

It is an arithmetic number, because the mean of its divisors is an integer number (13282080).

Almost surely, 2^129500007 is an apocalyptic number.

129500007 is a deficient number, since it is larger than the sum of its proper divisors (83013273).

129500007 is a wasteful number, since it uses less digits than its factorization.

129500007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474382.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 129500007 is about 11379.8069843034. The cubic root of 129500007 is about 505.9294154434.

Adding to 129500007 its reverse (700005921), we get a palindrome (829505928).

The spelling of 129500007 in words is "one hundred twenty-nine million, five hundred thousand, seven".