129138016 has 24 divisors (see below), whose sum is σ = 290561040. Its totient is φ = 55344768.

The previous prime is 129138007. The next prime is 129138017. The reversal of 129138016 is 610831921.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129138017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288031 + ... + 288478.

It is an arithmetic number, because the mean of its divisors is an integer number (12106710).

Almost surely, 2^129138016 is an apocalyptic number.

129138016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129138016 is an abundant number, since it is smaller than the sum of its proper divisors (161423024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129138016 is an equidigital number, since it uses as much as digits as its factorization.

129138016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576526 (or 576518 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 129138016 is about 11363.8908829679. The cubic root of 129138016 is about 505.4575678348.

Adding to 129138016 its reverse (610831921), we get a palindrome (739969937).

The spelling of 129138016 in words is "one hundred twenty-nine million, one hundred thirty-eight thousand, sixteen".