129789756 has 48 divisors (see below), whose sum is σ = 340569600. Its totient is φ = 42739056.

The previous prime is 129789749. The next prime is 129789763. The reversal of 129789756 is 657987921.

It is an interprime number because it is at equal distance from previous prime (129789749) and next prime (129789763).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1725 + ... + 16203.

It is an arithmetic number, because the mean of its divisors is an integer number (7095200).

Almost surely, 2^129789756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129789756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170284800).

129789756 is an abundant number, since it is smaller than the sum of its proper divisors (210779844).

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

129789756 is a wasteful number, since it uses less digits than its factorization.

129789756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14575 (or 14567 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 129789756 is about 11392.5307109527. The cubic root of 129789756 is about 506.3064639353.

The spelling of 129789756 in words is "one hundred twenty-nine million, seven hundred eighty-nine thousand, seven hundred fifty-six".