129219768 has 24 divisors (see below), whose sum is σ = 349970400. Its totient is φ = 43073232.

The previous prime is 129219743. The next prime is 129219791. The reversal of 129219768 is 867912921.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 897288 + ... + 897431.

It is an arithmetic number, because the mean of its divisors is an integer number (14582100).

Almost surely, 2^129219768 is an apocalyptic number.

129219768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129219768 is an abundant number, since it is smaller than the sum of its proper divisors (220750632).

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

129219768 is a wasteful number, since it uses less digits than its factorization.

129219768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794731 (or 1794724 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 129219768 is about 11367.4873213037. The cubic root of 129219768 is about 505.5642068443.

The spelling of 129219768 in words is "one hundred twenty-nine million, two hundred nineteen thousand, seven hundred sixty-eight".