129747409 has 16 divisors (see below), whose sum is σ = 149402880. Its totient is φ = 111436560.

The previous prime is 129747407. The next prime is 129747413. The reversal of 129747409 is 904747921.

It is a cyclic number.

It is not a de Polignac number, because 129747409 - 2¹ = 129747407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129747407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108714 + ... + 109900.

It is an arithmetic number, because the mean of its divisors is an integer number (9337680).

Almost surely, 2^129747409 is an apocalyptic number.

129747409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

129747409 is a deficient number, since it is larger than the sum of its proper divisors (19655471).

129747409 is a wasteful number, since it uses less digits than its factorization.

129747409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 129747409 is about 11390.6720170497. The cubic root of 129747409 is about 506.2513930968.

The spelling of 129747409 in words is "one hundred twenty-nine million, seven hundred forty-seven thousand, four hundred nine".