129265830 has 48 divisors (see below), whose sum is σ = 338541840. Its totient is φ = 34219584.

The previous prime is 129265733. The next prime is 129265853. The reversal of 129265830 is 38562921.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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, 7344 + ... + 17676.

It is an arithmetic number, because the mean of its divisors is an integer number (7052955).

Almost surely, 2^129265830 is an apocalyptic number.

129265830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129265830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169270920).

129265830 is an abundant number, since it is smaller than the sum of its proper divisors (209276010).

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

129265830 is a wasteful number, since it uses less digits than its factorization.

129265830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10485 (or 10482 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 129265830 is about 11369.5131821903. The cubic root of 129265830 is about 505.6242712663.

The spelling of 129265830 in words is "one hundred twenty-nine million, two hundred sixty-five thousand, eight hundred thirty".