129225220 has 12 divisors (see below), whose sum is σ = 271373004. Its totient is φ = 51690080.

The previous prime is 129225197. The next prime is 129225221. The reversal of 129225220 is 22522921.

It can be written as a sum of positive squares in 2 ways, for example, as 59969536 + 69255684 = 7744^2 + 8322^2 .

It is not an unprimeable number, because it can be changed into a prime (129225221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3230611 + ... + 3230650.

It is an arithmetic number, because the mean of its divisors is an integer number (22614417).

Almost surely, 2^129225220 is an apocalyptic number.

129225220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129225220 is an abundant number, since it is smaller than the sum of its proper divisors (142147784).

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

129225220 is a wasteful number, since it uses less digits than its factorization.

129225220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6461270 (or 6461268 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 129225220 is about 11367.7271255075. The cubic root of 129225220 is about 505.5713169466.

The spelling of 129225220 in words is "one hundred twenty-nine million, two hundred twenty-five thousand, two hundred twenty".