129386780 has 48 divisors (see below), whose sum is σ = 284407200. Its totient is φ = 49390848.

The previous prime is 129386771. The next prime is 129386783. The reversal of 129386780 is 87683921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129386783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37571 + ... + 40869.

It is an arithmetic number, because the mean of its divisors is an integer number (5925150).

Almost surely, 2^129386780 is an apocalyptic number.

129386780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129386780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142203600).

129386780 is an abundant number, since it is smaller than the sum of its proper divisors (155020420).

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

129386780 is a wasteful number, since it uses less digits than its factorization.

129386780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398 (or 3396 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 129386780 is about 11374.8309877554. The cubic root of 129386780 is about 505.7819210537.

The spelling of 129386780 in words is "one hundred twenty-nine million, three hundred eighty-six thousand, seven hundred eighty".