129426216 has 64 divisors (see below), whose sum is σ = 335301120. Its totient is φ = 41603520.

The previous prime is 129426197. The next prime is 129426251. The reversal of 129426216 is 612624921.

It is a super-2 number, since 2×129426216² = 33502290776157312, which contains 22 as substring.

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, 84901 + ... + 86411.

It is an arithmetic number, because the mean of its divisors is an integer number (5239080).

Almost surely, 2^129426216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129426216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167650560).

129426216 is an abundant number, since it is smaller than the sum of its proper divisors (205874904).

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

129426216 is a wasteful number, since it uses less digits than its factorization.

129426216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646 (or 1642 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 129426216 is about 11376.5643319941. The cubic root of 129426216 is about 505.8333018560.

The spelling of 129426216 in words is "one hundred twenty-nine million, four hundred twenty-six thousand, two hundred sixteen".