129400920 has 192 divisors, whose sum is σ = 470564640. Its totient is φ = 30566400.

The previous prime is 129400907. The next prime is 129400939. The reversal of 129400920 is 29004921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161962 + ... + 162758.

Almost surely, 2^129400920 is an apocalyptic number.

129400920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129400920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235282320).

129400920 is an abundant number, since it is smaller than the sum of its proper divisors (341163720).

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

129400920 is a wasteful number, since it uses less digits than its factorization.

129400920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 129400920 is about 11375.4525184715. The cubic root of 129400920 is about 505.8003451303.

The spelling of 129400920 in words is "one hundred twenty-nine million, four hundred thousand, nine hundred twenty".