129769122340 has 96 divisors (see below), whose sum is σ = 320380220160. Its totient is φ = 43528588800.

The previous prime is 129769122323. The next prime is 129769122341. The reversal of 129769122340 is 43221967921.

It is a super-2 number, since 2×129769122340² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129769122341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4306446 + ... + 4336474.

It is an arithmetic number, because the mean of its divisors is an integer number (3337293960).

Almost surely, 2^129769122340 is an apocalyptic number.

129769122340 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 129769122340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160190110080).

129769122340 is an abundant number, since it is smaller than the sum of its proper divisors (190611097820).

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

129769122340 is a wasteful number, since it uses less digits than its factorization.

129769122340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31573 (or 31571 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 129769122340 in words is "one hundred twenty-nine billion, seven hundred sixty-nine million, one hundred twenty-two thousand, three hundred forty".