129020290 has 16 divisors (see below), whose sum is σ = 265413312. Its totient is φ = 44235504.

The previous prime is 129020267. The next prime is 129020291. The reversal of 129020290 is 92020921.

It is not an unprimeable number, because it can be changed into a prime (129020291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921504 + ... + 921643.

It is an arithmetic number, because the mean of its divisors is an integer number (16588332).

Almost surely, 2^129020290 is an apocalyptic number.

129020290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129020290 is an abundant number, since it is smaller than the sum of its proper divisors (136393022).

129020290 is a wasteful number, since it uses less digits than its factorization.

129020290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843161.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 129020290 is about 11358.7098739249. The cubic root of 129020290 is about 505.3039244927.

The spelling of 129020290 in words is "one hundred twenty-nine million, twenty thousand, two hundred ninety".