129988418 has 16 divisors (see below), whose sum is σ = 224541504. Its totient is φ = 55283280.

The previous prime is 129988403. The next prime is 129988421. The reversal of 129988418 is 814889921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33605 + ... + 37272.

It is an arithmetic number, because the mean of its divisors is an integer number (14033844).

Almost surely, 2^129988418 is an apocalyptic number.

129988418 is a deficient number, since it is larger than the sum of its proper divisors (94553086).

129988418 is a wasteful number, since it uses less digits than its factorization.

129988418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71017.

The product of its digits is 331776, while the sum is 50.

The square root of 129988418 is about 11401.2463353793. The cubic root of 129988418 is about 506.5646573451.

The spelling of 129988418 in words is "one hundred twenty-nine million, nine hundred eighty-eight thousand, four hundred eighteen".