129123404 has 12 divisors (see below), whose sum is σ = 226046184. Its totient is φ = 64538784.

The previous prime is 129123389. The next prime is 129123413. The reversal of 129123404 is 404321921.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16712 + ... + 23184.

It is an arithmetic number, because the mean of its divisors is an integer number (18837182).

Almost surely, 2^129123404 is an apocalyptic number.

It is an amenable number.

129123404 is a deficient number, since it is larger than the sum of its proper divisors (96922780).

129123404 is a wasteful number, since it uses less digits than its factorization.

129123404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11464 (or 11462 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 129123404 is about 11363.2479511802. The cubic root of 129123404 is about 505.4385028974.

The spelling of 129123404 in words is "one hundred twenty-nine million, one hundred twenty-three thousand, four hundred four".