129979418 has 32 divisors (see below), whose sum is σ = 209563200. Its totient is φ = 60286464.

The previous prime is 129979391. The next prime is 129979439. The reversal of 129979418 is 814979921.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 659696 + ... + 659892.

It is an arithmetic number, because the mean of its divisors is an integer number (6548850).

Almost surely, 2^129979418 is an apocalyptic number.

129979418 is a deficient number, since it is larger than the sum of its proper divisors (79583782).

129979418 is a wasteful number, since it uses less digits than its factorization.

129979418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494.

The product of its digits is 326592, while the sum is 50.

The square root of 129979418 is about 11400.8516348561. The cubic root of 129979418 is about 506.5529660800.

The spelling of 129979418 in words is "one hundred twenty-nine million, nine hundred seventy-nine thousand, four hundred eighteen".