129233970 has 72 divisors (see below), whose sum is σ = 346850244. Its totient is φ = 33360768.

The previous prime is 129233959. The next prime is 129233971. The reversal of 129233970 is 79332921.

It can be written as a sum of positive squares in 6 ways, for example, as 129208689 + 25281 = 11367^2 + 159^2 .

It is not an unprimeable number, because it can be changed into a prime (129233971) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 655912 + ... + 656108.

Almost surely, 2^129233970 is an apocalyptic number.

129233970 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 129233970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173425122).

129233970 is an abundant number, since it is smaller than the sum of its proper divisors (217616274).

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

129233970 is a wasteful number, since it uses less digits than its factorization.

129233970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 129233970 is about 11368.1119804478. Note that the first 3 decimals coincide. The cubic root of 129233970 is about 505.5827276428.

The spelling of 129233970 in words is "one hundred twenty-nine million, two hundred thirty-three thousand, nine hundred seventy".