129016723 has 8 divisors (see below), whose sum is σ = 149024880. Its totient is φ = 110388480.

The previous prime is 129016721. The next prime is 129016747. The reversal of 129016723 is 327610921.

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

It is not a de Polignac number, because 129016723 - 2¹ = 129016721 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129016721) 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, 344778 + ... + 345151.

It is an arithmetic number, because the mean of its divisors is an integer number (18628110).

Almost surely, 2^129016723 is an apocalyptic number.

129016723 is a deficient number, since it is larger than the sum of its proper divisors (20008157).

129016723 is a wasteful number, since it uses less digits than its factorization.

129016723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689957.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 129016723 is about 11358.5528567683. The cubic root of 129016723 is about 505.2992677685.

The spelling of 129016723 in words is "one hundred twenty-nine million, sixteen thousand, seven hundred twenty-three".