129199220 has 48 divisors (see below), whose sum is σ = 278138448. Its totient is φ = 50396160.

The previous prime is 129199181. The next prime is 129199223. The reversal of 129199220 is 22991921.

It can be written as a sum of positive squares in 8 ways, for example, as 40500496 + 88698724 = 6364^2 + 9418^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129199223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166754 + ... + 167526.

It is an arithmetic number, because the mean of its divisors is an integer number (5794551).

Almost surely, 2^129199220 is an apocalyptic number.

129199220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129199220 is an abundant number, since it is smaller than the sum of its proper divisors (148939228).

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

129199220 is a wasteful number, since it uses less digits than its factorization.

129199220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 129199220 is about 11366.5834796565. The cubic root of 129199220 is about 505.5374078383.

The spelling of 129199220 in words is "one hundred twenty-nine million, one hundred ninety-nine thousand, two hundred twenty".