129906424 has 8 divisors (see below), whose sum is σ = 243574560. Its totient is φ = 64953208.

The previous prime is 129906421. The next prime is 129906431. The reversal of 129906424 is 424609921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×129906424³ (a number of 25 digits) contains 333 as substring.

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 as a sum of consecutive naturals, namely, 8119144 + ... + 8119159.

It is an arithmetic number, because the mean of its divisors is an integer number (30446820).

Almost surely, 2^129906424 is an apocalyptic number.

It is an amenable number.

129906424 is a deficient number, since it is larger than the sum of its proper divisors (113668136).

129906424 is a wasteful number, since it uses less digits than its factorization.

129906424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16238309 (or 16238305 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 129906424 is about 11397.6499332099. The cubic root of 129906424 is about 506.4581247801.

The spelling of 129906424 in words is "one hundred twenty-nine million, nine hundred six thousand, four hundred twenty-four".