129578423 has 12 divisors (see below), whose sum is σ = 147282408. Its totient is φ = 113311440.

The previous prime is 129578413. The next prime is 129578459. The reversal of 129578423 is 324875921.

It is not a de Polignac number, because 129578423 - 2⁶ = 129578359 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129578413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9113 + ... + 18498.

It is an arithmetic number, because the mean of its divisors is an integer number (12273534).

Almost surely, 2^129578423 is an apocalyptic number.

129578423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

129578423 is a deficient number, since it is larger than the sum of its proper divisors (17703985).

129578423 is a wasteful number, since it uses less digits than its factorization.

129578423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27662 (or 27643 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 129578423 is about 11383.2518640325. The cubic root of 129578423 is about 506.0315131368.

The spelling of 129578423 in words is "one hundred twenty-nine million, five hundred seventy-eight thousand, four hundred twenty-three".