129923401 has 8 divisors (see below), whose sum is σ = 138005640. Its totient is φ = 121890048.

The previous prime is 129923377. The next prime is 129923407. The reversal of 129923401 is 104329921.

It can be written as a sum of positive squares in 4 ways, for example, as 13801225 + 116122176 = 3715^2 + 10776^2 .

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 129923401 - 2⁹ = 129922889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129923407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6666 + ... + 17443.

It is an arithmetic number, because the mean of its divisors is an integer number (17250705).

Almost surely, 2^129923401 is an apocalyptic number.

It is an amenable number.

129923401 is a deficient number, since it is larger than the sum of its proper divisors (8082239).

129923401 is a wasteful number, since it uses less digits than its factorization.

129923401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24443.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 129923401 is about 11398.3946676714. The cubic root of 129923401 is about 506.4801862117.

The spelling of 129923401 in words is "one hundred twenty-nine million, nine hundred twenty-three thousand, four hundred one".