129823723 has 2 divisors, whose sum is σ = 129823724. Its totient is φ = 129823722.

The previous prime is 129823721. The next prime is 129823739. The reversal of 129823723 is 327328921.

It is a weak prime.

It is an emirp because it is prime and its reverse (327328921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129823723 - 2¹ = 129823721 is a prime.

Together with 129823721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129823721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64911861 + 64911862.

It is an arithmetic number, because the mean of its divisors is an integer number (64911862).

Almost surely, 2^129823723 is an apocalyptic number.

129823723 is a deficient number, since it is larger than the sum of its proper divisors (1).

129823723 is an equidigital number, since it uses as much as digits as its factorization.

129823723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 129823723 is about 11394.0213708769. The cubic root of 129823723 is about 506.3506282108.

The spelling of 129823723 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, seven hundred twenty-three".