129450840 has 32 divisors (see below), whose sum is σ = 388352880. Its totient is φ = 34520192.

The previous prime is 129450803. The next prime is 129450911. The reversal of 129450840 is 48054921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539259 + ... + 539498.

Almost surely, 2^129450840 is an apocalyptic number.

129450840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129450840 is an abundant number, since it is smaller than the sum of its proper divisors (258902040).

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

129450840 is a wasteful number, since it uses less digits than its factorization.

129450840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078771 (or 1078767 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 129450840 is about 11377.6465053191. The cubic root of 129450840 is about 505.8653789467.

The spelling of 129450840 in words is "one hundred twenty-nine million, four hundred fifty thousand, eight hundred forty".