129441923 has 16 divisors (see below), whose sum is σ = 142217376. Its totient is φ = 117089280.

The previous prime is 129441919. The next prime is 129441931. The reversal of 129441923 is 329144921.

It is a cyclic number.

It is not a de Polignac number, because 129441923 - 2² = 129441919 is a prime.

It is a super-2 number, since 2×129441923² = 33510422859875858, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129441973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307253 + ... + 307673.

It is an arithmetic number, because the mean of its divisors is an integer number (8888586).

Almost surely, 2^129441923 is an apocalyptic number.

129441923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

129441923 is a deficient number, since it is larger than the sum of its proper divisors (12775453).

129441923 is a wasteful number, since it uses less digits than its factorization.

129441923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854.

The product of its digits is 15552, while the sum is 35.

The square root of 129441923 is about 11377.2546336979. The cubic root of 129441923 is about 505.8537634558.

The spelling of 129441923 in words is "one hundred twenty-nine million, four hundred forty-one thousand, nine hundred twenty-three".