129030623 has 4 divisors (see below), whose sum is σ = 129706368. Its totient is φ = 128354880.

The previous prime is 129030617. The next prime is 129030641. The reversal of 129030623 is 326030921.

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 129030623 - 2¹⁰ = 129029599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129030592 and 129030601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129030613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337586 + ... + 337967.

It is an arithmetic number, because the mean of its divisors is an integer number (32426592).

Almost surely, 2^129030623 is an apocalyptic number.

129030623 is a deficient number, since it is larger than the sum of its proper divisors (675745).

129030623 is an equidigital number, since it uses as much as digits as its factorization.

129030623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675744.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 129030623 is about 11359.1647140096. The cubic root of 129030623 is about 505.3174137562.

It can be divided in two parts, 1290 and 30623, that added together give a palindrome (31913).

The spelling of 129030623 in words is "one hundred twenty-nine million, thirty thousand, six hundred twenty-three".