129823320 has 96 divisors (see below), whose sum is σ = 428142960. Its totient is φ = 31468800.

The previous prime is 129823313. The next prime is 129823399. The reversal of 129823320 is 23328921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10050 + ... + 18990.

Almost surely, 2^129823320 is an apocalyptic number.

129823320 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 129823320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214071480).

129823320 is an abundant number, since it is smaller than the sum of its proper divisors (298319640).

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

129823320 is a wasteful number, since it uses less digits than its factorization.

129823320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8977 (or 8962 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 129823320 is about 11394.0036861500. The cubic root of 129823320 is about 506.3501042708.

The spelling of 129823320 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, three hundred twenty".