129408998 has 24 divisors (see below), whose sum is σ = 209096472. Its totient is φ = 60044544.

The previous prime is 129408989. The next prime is 129409003. The reversal of 129408998 is 899804921.

It is a happy number.

129408998 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40661 + ... + 43727.

It is an arithmetic number, because the mean of its divisors is an integer number (8712353).

Almost surely, 2^129408998 is an apocalyptic number.

129408998 is a deficient number, since it is larger than the sum of its proper divisors (79687474).

129408998 is a wasteful number, since it uses less digits than its factorization.

129408998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3176 (or 3159 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 129408998 is about 11375.8075757284. The cubic root of 129408998 is about 505.8108699657.

The spelling of 129408998 in words is "one hundred twenty-nine million, four hundred eight thousand, nine hundred ninety-eight".