129744609 has 8 divisors (see below), whose sum is σ = 173334720. Its totient is φ = 86325456.

The previous prime is 129744569. The next prime is 129744649. The reversal of 129744609 is 906447921.

It is an interprime number because it is at equal distance from previous prime (129744569) and next prime (129744649).

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

It is not a de Polignac number, because 129744609 - 2⁸ = 129744353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129744649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40957 + ... + 44010.

It is an arithmetic number, because the mean of its divisors is an integer number (21666840).

Almost surely, 2^129744609 is an apocalyptic number.

It is an amenable number.

129744609 is a deficient number, since it is larger than the sum of its proper divisors (43590111).

129744609 is an equidigital number, since it uses as much as digits as its factorization.

129744609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85479.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 129744609 is about 11390.5491088007. The cubic root of 129744609 is about 506.2477513694.

The spelling of 129744609 in words is "one hundred twenty-nine million, seven hundred forty-four thousand, six hundred nine".