129413840 has 40 divisors (see below), whose sum is σ = 310599168. Its totient is φ = 50094720.

The previous prime is 129413839. The next prime is 129413857. The reversal of 129413840 is 48314921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×129413840³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129413797 and 129413806.

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, 23612 + ... + 28571.

Almost surely, 2^129413840 is an apocalyptic number.

129413840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129413840 is an abundant number, since it is smaller than the sum of its proper divisors (181185328).

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

129413840 is a wasteful number, since it uses less digits than its factorization.

129413840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52227 (or 52221 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 129413840 is about 11376.0203937933. The cubic root of 129413840 is about 505.8171784031.

The spelling of 129413840 in words is "one hundred twenty-nine million, four hundred thirteen thousand, eight hundred forty".