129145729 has 8 divisors (see below), whose sum is σ = 133824960. Its totient is φ = 124481616.

The previous prime is 129145697. The next prime is 129145739. The reversal of 129145729 is 927541921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129145729 - 2⁵ = 129145697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129145691 and 129145700.

It is not an unprimeable number, because it can be changed into a prime (129145739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15322 + ... + 22204.

It is an arithmetic number, because the mean of its divisors is an integer number (16728120).

Almost surely, 2^129145729 is an apocalyptic number.

It is an amenable number.

129145729 is a deficient number, since it is larger than the sum of its proper divisors (4679231).

129145729 is an equidigital number, since it uses as much as digits as its factorization.

129145729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7559.

The product of its digits is 45360, while the sum is 40.

The square root of 129145729 is about 11364.2302422997. The cubic root of 129145729 is about 505.4676307549.

The spelling of 129145729 in words is "one hundred twenty-nine million, one hundred forty-five thousand, seven hundred twenty-nine".