129906423 has 20 divisors (see below), whose sum is σ = 194674480. Its totient is φ = 86329152.

The previous prime is 129906421. The next prime is 129906431. The reversal of 129906423 is 324609921.

129906423 is a `hidden beast` number, since 1 + 2 + 9 + 9 + 0 + 642 + 3 = 666.

It is not a de Polignac number, because 129906423 - 2¹ = 129906421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129906421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24918 + ... + 29676.

It is an arithmetic number, because the mean of its divisors is an integer number (9733724).

Almost surely, 2^129906423 is an apocalyptic number.

129906423 is a deficient number, since it is larger than the sum of its proper divisors (64768057).

129906423 is an equidigital number, since it uses as much as digits as its factorization.

129906423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108 (or 5099 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 129906423 is about 11397.6498893412. The cubic root of 129906423 is about 506.4581234805.

The spelling of 129906423 in words is "one hundred twenty-nine million, nine hundred six thousand, four hundred twenty-three".