129707749 has 8 divisors (see below), whose sum is σ = 134350560. Its totient is φ = 125076336.

The previous prime is 129707717. The next prime is 129707759. The reversal of 129707749 is 947707921.

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 129707749 - 2⁵ = 129707717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129707699 and 129707708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129707759) 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, 25102 + ... + 29824.

It is an arithmetic number, because the mean of its divisors is an integer number (16793820).

Almost surely, 2^129707749 is an apocalyptic number.

It is an amenable number.

129707749 is a deficient number, since it is larger than the sum of its proper divisors (4642811).

129707749 is an equidigital number, since it uses as much as digits as its factorization.

129707749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699.

The product of its (nonzero) digits is 222264, while the sum is 46.

The square root of 129707749 is about 11388.9309858301. The cubic root of 129707749 is about 506.1998057434.

The spelling of 129707749 in words is "one hundred twenty-nine million, seven hundred seven thousand, seven hundred forty-nine".