129099516 has 72 divisors (see below), whose sum is σ = 377390160. Its totient is φ = 34046208.

The previous prime is 129099511. The next prime is 129099527. The reversal of 129099516 is 615990921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129099511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 801 + ... + 16088.

It is an arithmetic number, because the mean of its divisors is an integer number (5241530).

Almost surely, 2^129099516 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 129099516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188695080).

129099516 is an abundant number, since it is smaller than the sum of its proper divisors (248290644).

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

129099516 is a wasteful number, since it uses less digits than its factorization.

129099516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16923 (or 16914 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 129099516 is about 11362.1967946344. The cubic root of 129099516 is about 505.4073320453.

The spelling of 129099516 in words is "one hundred twenty-nine million, ninety-nine thousand, five hundred sixteen".