129723347 has 4 divisors (see below), whose sum is σ = 139702080. Its totient is φ = 119744616.

The previous prime is 129723343. The next prime is 129723353. The reversal of 129723347 is 743327921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129723347 - 2² = 129723343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129723347.

It is not an unprimeable number, because it can be changed into a prime (129723343) 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 3 ways as a sum of consecutive naturals, for example, 4989347 + ... + 4989372.

It is an arithmetic number, because the mean of its divisors is an integer number (34925520).

Almost surely, 2^129723347 is an apocalyptic number.

129723347 is a deficient number, since it is larger than the sum of its proper divisors (9978733).

129723347 is an equidigital number, since it uses as much as digits as its factorization.

129723347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9978732.

The product of its digits is 63504, while the sum is 38.

The square root of 129723347 is about 11389.6157529567. The cubic root of 129723347 is about 506.2200959423.

The spelling of 129723347 in words is "one hundred twenty-nine million, seven hundred twenty-three thousand, three hundred forty-seven".