129212930 has 32 divisors (see below), whose sum is σ = 289975680. Its totient is φ = 40273920.

The previous prime is 129212927. The next prime is 129212957. The reversal of 129212930 is 39212921.

It is a junction number, because it is equal to n+sod(n) for n = 129212893 and 129212902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83135 + ... + 84674.

It is an arithmetic number, because the mean of its divisors is an integer number (9061740).

Almost surely, 2^129212930 is an apocalyptic number.

129212930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129212930 is an abundant number, since it is smaller than the sum of its proper divisors (160762750).

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

129212930 is a wasteful number, since it uses less digits than its factorization.

129212930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167834.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 129212930 is about 11367.1865472508. The cubic root of 129212930 is about 505.5552889388. Note that the first 3 decimals are identical.

Subtracting from 129212930 its reverse (39212921), we obtain a palindrome (90000009).

It can be divided in two parts, 12921 and 2930, that added together give a palindrome (15851).

The spelling of 129212930 in words is "one hundred twenty-nine million, two hundred twelve thousand, nine hundred thirty".