129909623 has 8 divisors (see below), whose sum is σ = 135991296. Its totient is φ = 123946200.

The previous prime is 129909613. The next prime is 129909641. The reversal of 129909623 is 326909921.

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

It is a cyclic number.

It is not a de Polignac number, because 129909623 - 2¹⁰ = 129908599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129909613) 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, 27311 + ... + 31712.

It is an arithmetic number, because the mean of its divisors is an integer number (16998912).

Almost surely, 2^129909623 is an apocalyptic number.

129909623 is a deficient number, since it is larger than the sum of its proper divisors (6081673).

129909623 is an equidigital number, since it uses as much as digits as its factorization.

129909623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59125.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 129909623 is about 11397.7902682932. The cubic root of 129909623 is about 506.4622819936.

The spelling of 129909623 in words is "one hundred twenty-nine million, nine hundred nine thousand, six hundred twenty-three".